[Federal Register Volume 64, Number 250 (Thursday, December 30, 1999)]
[Proposed Rules]
[Pages 73612-73674]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 99-33403]


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DEPARTMENT OF TRANSPORTATION

Federal Highway Administration

23 CFR Part 655

[FHWA Docket No. FHWA-99-6575]
RIN 2125-AE71


Revision of the Manual on Uniform Traffic Control Devices; 
General Provisions, Markings, and Signals

AGENCY: Federal Highway Administration (FHWA), DOT.

ACTION: Notice of proposed amendments to the Manual on Uniform Traffic 
Control Devices (MUTCD); request for comments.

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SUMMARY: The MUTCD is incorporated by reference in 23 CFR part 655, 
subpart F, approved by the Federal Highway Administrator, and 
recognized as the national standard for traffic control on all public 
roads. The FHWA announced its intent to rewrite and reformat the MUTCD 
on January 10, 1992, at 57 FR 1134. The purpose of this rewrite effort 
is to reformat the text for clarity of intended meanings, to include 
metric dimensions and values for the design and installation of traffic 
control devices, and to improve the overall organization and discussion 
of the contents in the MUTCD.
    This document proposes new text for the MUTCD in Part 1--General 
Provisions, Part 3--Markings, and Part 4--Signals. The proposed changes 
included herein are intended to expedite traffic, promote uniformity, 
improve safety, and incorporate technology advances in traffic control 
device application.

DATES: Submit comments on or before June 30, 2000.

ADDRESSES: Signed, written comments should refer to the docket number 
that appears at the top of this document and must be submitted to the 
Docket Clerk, U.S. DOT Dockets, Room PL-401, 400 Seventh Street, SW., 
Washington, DC 20590-0001. All comments received will be available for 
examination at the above address between 9 a.m. and 5 p.m., e.t., 
Monday through Friday, except Federal holidays. Those desiring 
notification of receipt of comments must include a self-addressed, 
stamped postcard.

FOR FURTHER INFORMATION CONTACT: For information regarding the notice 
of proposed amendments contact Ms. Linda Brown, Office of 
Transportation Operations, Room 3408, (202) 366-2192, or Mr. Raymond 
Cuprill, Office of Chief Counsel, Room 4217, (202) 366-0834, Department 
of Transportation, Federal Highway Administration, 400 Seventh Street, 
SW., Washington, DC 20590.

SUPPLEMENTARY INFORMATION:

Electronic Access

    Internet users may access all comments received by the U.S. DOT 
Dockets, Room PL-401, by using the universal resource locator (URL): 
see ``Addresses'' http:/dms.dot.gov. It is available 24 hours each day, 
365 days each year. Please follow the instructions online for more 
information and help. An electronic copy of this notice of proposed 
amendment may be downloaded using a modem and suitable communications 
software from the Government Printing Office's Electronic Bulletin 
Board Service at (202) 512-1661. Internet users may reach the Office of 
the Federal Register's home page at: http://www.nara.gov/fedreg and the 
Government Printing Office's database at: http://www.access.gpo.gov/
nara.
    The text for the proposed sections of the MUTCD is available from 
the FHWA Office of Transportation Operations (HOTO-1) or from the FHWA 
Home Page at the URL: http://www.ohs.fhwa.dot.gov/operations/mutcd. 
Please note that the proposed rewrite sections contained in this docket 
for the MUTCD Part 1, Part 3, and Part 4 will take approximately 8 
weeks from the date of publication before they will be available at 
this web site.

Background

    The 1988 MUTCD with its revisions are available for inspection and 
copying as prescribed in 49 CFR part 7. It may be purchased for $57.00 
(Domestic) or $71.25 (Foreign) from the Superintendent of Documents, 
U.S. Government Printing Office, P.O. Box 371954, Pittsburgh, PA 15250-
7954, Stock No. 650-001-00001-0. This notice is being issued to provide 
an opportunity for public comment on the desirability of proposed 
amendments to the MUTCD. Based on the comments received and its own 
experience, the FHWA may issue a final rule concerning the proposed 
changes included in this notice.
    The National Committee on Uniform Traffic Control Devices (NCUTCD) 
has taken the lead in this effort to rewrite and reformat the MUTCD. 
The NCUTCD is a national organization of individuals

[[Page 73613]]

from the American Association of State Highway and Transportation 
Officials (AASHTO), the Institute of Transportation Engineers (ITE), 
the National Association of County Engineers (NACE), the American 
Public Works Association (APWA), and other organizations that have 
extensive experience in the installation and maintenance of traffic 
control devices. The NCUTCD voluntarily assumed the arduous task of 
rewriting and reformatting the MUTCD. The NCUTCD proposal is available 
from the U.S. DOT Dockets (see address above). Pursuant to 23 CFR part 
655, the FHWA is responsible for approval of changes to the MUTCD.
    Although the MUTCD will be revised in its entirety, it is being 
completed in phases due to the enormous volume of text. The FHWA has 
reviewed the NCUTCD's proposals for the MUTCD. The summary of proposed 
changes for Parts 3, 4, and 8 was published as Phase 1 of the MUTCD 
rewrite effort in a previous notice of proposed amendment dated January 
6, 1997, at 62 FR 691. The summary of proposed changes for Parts 1 and 
7 was published as phase 2 of the MUTCD rewrite effort in a previous 
notice of proposed amendment dated December 5, 1997, at 62 FR 64324. 
The summary of proposed changes for Chapters 2A, 2D, 2E, 2F, and 2I was 
published as Phase 3 of the MUTCD rewrite effort in a previous notice 
of proposed amendment dated June 11, 1998, at 63 FR 31950. The summary 
of proposed changes for Chapters 2G--Tourist Oriented Directional 
Signs, Chapter 2H--Recreational and Cultural Interest Signs, and Part 
9--Traffic Control for Bicycles was published as Phase 4 of the MUTCD 
rewrite effort in a previous notice of proposed amendment dated June 
24, 1999, at 64 FR 33802. The summary of proposed changes for Chapter 
2C--Warning Signs and Part 10--Traffic Control for Highway-Light Rail 
Transit Grade Crossings was published as Phase 5 of the MUTCD rewrite 
effort in a previous notice of proposed amendment dated June 24, 1999, 
at 64 FR 33806. The summary of proposed changes for Chapter 2B--
Regulatory Signs, Part 5--Traffic Control for Low-Volume Rural roads, 
and update information for Part 8--Traffic Control at Highway-Rail 
Grade Crossings was published as Phase 6 of the MUTCD rewrite effort in 
a previous notice of proposed amendment.
    The summary of proposed changes for Part 6--Traffic Controls for 
Street and Highway Construction, Maintenance, Utility, and Incident 
Management Operations will be published as Phase 8 of the MUTCD rewrite 
effort in a future notice of proposed amendment. This notice of 
proposed amendment is Phase 7 of the MUTCD rewrite effort and includes 
the summary of proposed changes for MUTCD Part 1--General Provisions, 
Part 3--Markings, and Part 4--Signals.
    The proposed new style of the MUTCD would be a 3-ring binder with 
8\1/2\ x 11 inch pages. Each part of the MUTCD would be printed 
separately in a bound format and then included in the 3-ring binder. If 
someone needed to reference information on a specific part of the 
MUTCD, it would be easy to remove that individual part from the binder. 
The proposed new text would be in column format and contain four 
categories as follows: (1) Standards--representing ``shall'' 
conditions; (2) Guidance--representing ``should'' conditions; (3) 
Options--representing ``may'' conditions; and (4) Support-- 
representing descriptive and/or general information. This new format 
would make it easier to distinguish standards, guidance, and optional 
conditions for the design, placement, and application of traffic 
control devices. The adopted final version of the new MUTCD will be in 
metric and English units. Dual units will be shown in the MUTCD 
particularly for speed limits, guide sign distances, and other 
measurements which the public must read.
    The FHWA invites comments on the proposed new text for the MUTCD 
Part 1, Part 3, and Part 4. Summaries of the proposed significant 
changes contained in these parts are included in the following 
discussions:

Discussion of Proposed Amendments to Part 1--General Provisions

    The summary of proposed changes for Part 1 was published as Phase 2 
of the MUTCD rewrite effort in a previous notice of proposed amendment 
dated December 5, 1997. Since that time, several more Phases were 
published with additional definitions. The following are the most 
significant proposed revisions to Part 1:
    1. In Section 1A.11, paragraph 3, the FHWA proposes to include a 
flow chart diagram showing the process for changes to the MUTCD and for 
experimentation with new traffic control devices and their application.
    2. In Section 1A.14, the definitions for the following terms apply 
only to Part 4--Signals. Therefore, the FHWA proposes to delete them 
from Part 1--General Provisions and discuss them in Part 4 only. The 
terms are: actuated operation, actuation, backplate, conflict monitor, 
controller assembly, controller unit, coordination, cycle length, dark 
mode, detector, flasher, full-actuated operation, interval, interval 
sequence, louver, pedestrian change interval, pedestrian clearance 
time, pedestrian signal head, permitted mode, preemption control, 
priority control, protected mode, ramp control signal, red clearance 
interval, signal lens, signal phase, signal section, signal system, 
signal visor, signal warrant, steady mode, visibility-limited signal 
indication, and yellow change interval. The FHWA proposes to only 
include definitions in Part 1A.14 for terms that are used in more than 
one specific part of the MUTCD.
    3. In Section 1A.14, the FHWA proposes to add the following 
definitions which appear in various sections of the MUTCD: Paved--A 
bituminous surface treatment, mixed bituminous concrete, or portland 
cement concrete roadway surface which has both a structural (weight 
bearing) and a sealing purpose for the roadway. Rural--A type of 
roadway as defined by the jurisdictions in compliance with their 
legislation, statute, regulations, and policies. Urban--A type of 
roadway as defined by the jurisdictions in compliance with their 
legislation, statute, regulations, and policies.
    4. The FHWA proposes to add a new Section 1A.15 entitled, 
``Abbreviations.'' This section will list the standard abbreviations 
for word messages used in connection with traffic control devices.

Discussion of Proposed Amendments to Part 3--Markings

    The summary of proposed changes for part 3 was published as Phase 1 
of the MUTCD rewrite effort in a previous notice of proposed amendment 
dated January 6, 1997. Since that time, a number of changes have been 
suggested to FHWA by the NCUTCD and others, and a number of applicable 
recommendations were made in the ``Older Driver Highway Design 
Handbook.'' 1 Section numbers used herein refer to the 
proposed text in the notice of proposed amendments dated January 6, 
1997.
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    \1\ ``Older Driver Highway Design Handbook,'' Report No. FHWA-
RD-99-045, available from the FHWA Research and Technology Report 
Center, 9701 Philadelphia Court, Unit Q, Lanham, Maryland 20706.
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    The FHWA has included Sections 3B.1, 3B.2, and 3B.3 in this notice 
so that those reviewing the following part 3 sections are aware of the 
Final Rule wording of these sections with regards to center lines and 
edge lines.
    1. In Section 3B.2, the FHWA proposes to add a standard, which was 
inadvertently omitted from the proposed amendment dated January 6,

[[Page 73614]]

1997, at 62 FR 691. The standard is that lane line markings shall be 
used on all Interstate highways and freeways.
    2. In Section 3B.4, paragraph 2, the FHWA proposes to add Figure 3-
9a to show more examples of using dotted line markings in intersections 
to extend longitudinal line markings. This proposed Figure is in 
response to older driver research that shows that motorists may benefit 
by having these additional markings.
    3. In Section 3B.9, paragraphs 2, 4, and 6, the FHWA proposes to 
add a ``Yield Line'' marking as an optional marking where it is 
important to indicate the point behind which vehicles are required to 
yield. The proposed Figure 3-24 provides an illustration of these 
markings.
    4. In Section 3B.12, paragraph 19, the FHWA proposes to add a 
``Yield Ahead'' triangle symbol marking for optional use in advance of 
intersections where approaching traffic will encounter a YIELD sign. 
The proposed Figure 3-25 provides an illustration of these markings.
    5. In Section 3B.13, the FHWA proposes to differentiate between 
types of preferential lanes. The diamond pavement marking symbol is 
proposed for exclusive HOV lane use. In situations where a preferential 
lane is not an HOV lane, then the word message (Bus, Taxi, etc.) or 
symbol (Bike, etc.) for the type of traffic allowed would be used.
    6. In Section 3B.15, paragraph 5, the FHWA proposes to add ``paved 
median noses'' to the locations that should have retroreflective solid 
yellow markings. This addition is in response to recommendations 
contained in the ``Older Driver Highway Design Handbook'' (see footnote 
1) which shows that motorists may benefit by having these additional 
markings.
    7. The FHWA proposes to add a new Section 3B.16 to provide 
standards for the longitudinal lane line markings for the various types 
of physically separated, reversible, non-reversible, and left and right 
side concurrent flow preferential lanes for motorized vehicles. The 
proposed Figure 3-23 provides an illustration of these markings. 
Furthermore, there is guidance on marking the neutral area between a 
preferential use lane and a regular traffic lane when the distance 
between them is greater than 1.2 m (4 ft).
    8. The FHWA proposes to add a new Section 3B.17 to incorporate 
standard markings for roundabouts since roundabouts are becoming more 
commonly used. The proposed Figure 3-26 provides an illustration of 
typical roundabout markings.
    9. The FHWA proposes to add a new Section 3B.18 to incorporate 
optional standard markings for other circular intersections including 
rotaries, traffic circles, and residential traffic calming designs. The 
proposed Figure 3-26a provides an illustration of typical markings for 
other circular intersections.
    10. The FHWA proposes to add a new Section 3B.19 to provide 
pavement markings to assist motorists in identifying the locations of 
speed humps. The proposed Figure 3-27 and Figure 3-28 provide 
illustrations of typical speed hump markings.
    11. The FHWA proposes to add a new Section 3B.20 to provide for 
pavement markings in advance of a speed hump where added visibility is 
desired or where a speed hump may not be expected. The proposed Figure 
3-29 provides an illustration of a typical advanced speed hump marking.

Discussion of Proposed Amendments to Part 4--Signals

    The summary of proposed changes for Part 4 was published as Phase 1 
of the MUTCD rewrite effort in a previous notice of proposed amendment 
dated January 6, 1997. Since that time, a number of changes have been 
suggested to FHWA, and a number of applicable recommendations were made 
in the ``Older Driver Highway Design Handbook'' (see footnote 1). 
Section numbers used herein refer to the proposed text in the notice of 
proposed amendments dated January 6, 1997.
    1. The FHWA proposes to change the name of Section 4B.2 to ``Basis 
of Installation or Removal of Traffic Control Signals'' to reflect that 
the section addresses both the installation and removal of traffic 
control signals. Under OPTION, a series of steps that may be considered 
in removing a traffic control signal is proposed.
    2. In Section 4C.1, paragraph 12, the category OPTION is added and 
a new paragraph (d) is proposed for the various data that may be 
included in the engineering study for determining whether a traffic 
control signal is needed: ``Information about nearby facilities and 
activity centers that serve the elderly, people with disabilities, and/
or requests from people with disabilities for accessible crossing 
improvements along this route. These people may not be adequately 
reflected in the pedestrian volume count if the lack of a signal 
restrains their mobility.'' The FHWA is withdrawing the proposal that 
was made in the January 6, 1997, notice of proposed amendments to move 
the School Crossing Warrant from Part 4 to Section 7D.4. (See 62 FR 
691, FHWA Docket No. 96-47 scanned into DOT's Document Management 
System as Docket No. 97-2295.) The FHWA proposes to keep it as Warrant 
5 in Section 4C.1. However, the FHWA proposes to include a reference in 
Chapter 7D.
    3. In Section 4D.3, paragraph 3, a new GUIDANCE is proposed: 
``Safety considerations should include the installation, where 
appropriate, of accessible pedestrian signals that provide information 
in nonvisual format (including audible tones, verbal messages, and/or 
vibrotactile information). Provisions for accessible signals are 
presented in Sections 4E.6 and 4E.8.'' This proposed change reflects 
the intent of language on Bicycle Transportation and Pedestrian 
Walkways contained in section 1202 of the Transportation Equity Act for 
the 21st Century, Public Law 105-178, 112 Stat. 107 (1998).
    4. In Section 4D.4, paragraph 2, the FHWA is withdrawing its 
proposal (See 62 FR 691, FHWA Docket No. 96-47 scanned into DOT's 
Document Management System as Docket No. 97-2295) to delete the phrase 
``Unless otherwise determined by law'' relative to the meaning of 
signal indications. The FHWA proposes to keep this statement because it 
encourages State and local entities to achieve uniform rules of the 
road that are in accord with Chapter 11, Rules of the Road, in the 
``Uniform Vehicle Code and Model Traffic Ordinance,'' (UVCMTO), Revised 
1992, published by the National Committee on Uniform Traffic Laws and 
Ordinances in Evanston, Illinois.
    5. In Section 4D.4, the FHWA proposes to revise paragraph 2c(1), 
paragraph 2, to delete the words, ``or a RED ARROW indication is 
displayed.'' This proposed deletion is in response to recommendations 
contained in the ``Older Driver Highway Design Handbook'' (see footnote 
1) which shows motorist confusion as to the meaning of the red arrow 
indication. In Figure 4-7 in Section 4D.16, the typical arrangement of 
lenses c and d are appropriately changed to eliminate the RED ARROW and 
to replace it with the CIRCULAR RED.
    6. The FHWA proposes to delete Section 4D.4, paragraph 2c(2). This 
proposed deletion is in response to recommendations contained in the 
``Older Driver Highway Design Handbook'' (see footnote 1) which shows 
motorist confusion as to the meaning of the red arrow indication.
    7. In Section 4D.4, the FHWA proposes to revise paragraph 2c(3) to

[[Page 73615]]

delete ``or RED ARROW.'' This proposed deletion is in response to 
recommendations contained in the ``Older Driver Highway Design 
Handbook'' (see footnote 1) which shows motorist confusion as to the 
meaning of the red arrow indication.
    8. In Section 4D.4, the FHWA proposes to revise paragraph 2d(3) to 
delete ``Flashing RED ARROW and.'' This proposed deletion is in 
response to recommendations contained in the ``Older Driver Highway 
Design Handbook'' (see footnote 1) which shows motorist confusion as to 
the meaning of the red arrow indication.
    9. In Section 4D.5, the FHWA proposes to delete paragraph 3(d) that 
reads, ``A steady RED ARROW indication shall be displayed when it is 
intended to prohibit traffic, except pedestrians directed by a 
pedestrian signal head, from entering the intersection or other 
controlled area to make the indicated turn. Turning on a steady RED 
ARROW indication shall not be permitted.'' This deletion would require 
a CIRCULAR RED signal indication to be used instead of a RED ARROW for 
right and left-turn indications. This is in response to recommendations 
contained in the ``Older Driver Highway Design Handbook'' (see footnote 
1) which shows motorist confusion as to the meaning of the red arrow 
indication. The compliance date proposed by FHWA for this change is 3 
years after the effective date of the final rule. This would allow 
State and local agencies time to implement this proposed change.
    10. The FHWA proposes to delete Section 4D.5, paragraph 3(e)(2) 
that reads, ``Shall not be displayed in conjunction with the change 
from a RED ARROW indication to a GREEN ARROW indication.'' This would 
delete the reference to the RED ARROW since the FHWA proposes to no 
longer use RED ARROWS in the MUTCD.
    11. In Section 4D.5, the FHWA proposes to revise paragraph 3(e)(4) 
to read, ``Shall be terminated by a CIRCULAR YELLOW indication or a 
CIRCULAR RED indication except.'' This would delete the reference to 
the RED ARROW since the FHWA proposes to no longer use RED ARROWS in 
the MUTCD.
    12. In Section 4D.5, the FHWA proposes to revise paragraph 4, 
OPTION, to delete the words, ``RED ARROW.'' This would delete the 
reference to the RED ARROW since the FHWA proposes to no longer use RED 
ARROWS in the MUTCD.
    13. In Section 4D.6, paragraph 2, the FHWA proposes to add a new 
STANDARD which defines a leading protected-only left turn phase as one 
in which the GREEN ARROW, YELLOW ARROW, and CIRCULAR RED is given to 
vehicles turning left from a particular street before the CIRCULAR 
GREEN indication is given to the through movement on the same street. 
This proposed addition to the MUTCD is currently used in the field and 
is recommended in the ``Older Driver Highway Design Handbook'' (see 
footnote 1).
    14. In Section 4D.6, paragraph 3, the FHWA proposes to add a new 
OPTION to read, ``A leading protected-only left turn phase may be 
considered if there is not a sufficient number of acceptable gaps for 
the left-turning movement.'' This proposed addition to the MUTCD is 
based on recommendations contained in the ``Older Driver Highway Design 
Handbook'' (see footnote 1) which shows a crash reduction with the use 
of a leading protected-only left-turn phase.
    15. In Section 4D.6, the FHWA proposes to delete paragraph 2b(1) 
which reads, ``RED, YELLOW, and GREEN left-turn ARROW indications only. 
Only one of the three lenses shall be illuminated at any given time. A 
signal instruction sign shall not be required with this set of signal 
indications. If used, it shall be a LEFT ON GREEN ARROW ONLY sign (R10-
5) or.'' This deletion would require a CIRCULAR RED signal indication 
to be used instead of a RED ARROW for left-turn indications. This is in 
response to recommendations contained in the ``Older Driver Highway 
Design Handbook'' (see footnote 1) that shows confusion as to the 
meaning of the red arrow indication. The compliance date for this 
change is proposed to be 3 years after the effective date of the final 
rule. This would allow State and local agencies time to implement this 
proposed change.
    16. In Section 4D.7, the FHWA proposes to revise paragraph 2(a) to 
replace ``RED ARROW'' with ``CIRCULAR RED,'' and add ``along with a 
RIGHT TURN SIGNAL sign, R10-10'' at the end of the sentence. This would 
delete the reference to the RED ARROW since the FHWA proposes to no 
longer use RED ARROWS in the MUTCD.
    17. In Section 4D.7, the FHWA proposes to delete paragraph 2 (1) 
that reads, ``RED, YELLOW, and GREEN right-turn ARROW indications only. 
One of the three lenses shall be illuminated at any given time. A 
signal instruction sign shall not be required with this set of signal 
indications. If used, it shall be a RIGHT ON GREEN ARROW ONLY sign 
(R10-5a); or.'' The purpose of this proposed change is to require a 
CIRCULAR RED instead of a RED ARROW for right-turn indications.
    18. In Section 4D.8, the FHWA proposes to revise paragraph 3 to no 
longer allow the display of red arrows on any signal face. The 
compliance date for this change is proposed to be 3 years after the 
effective date of the final rule. This would allow State and local 
agencies time to implement this proposed change.
    19. In Section 4D.11, the FHWA proposes to revise paragraphs 3 (b) 
and 3 (c) to delete the reference to red arrows.
    20. In Sections 4D.15 and 4D.17, the FHWA proposes to revise these 
sections to be consistent with a new maximum vertical viewing angle of 
20 degrees. In Section 4D.15, paragraph 1d (2) and Section 4D.17, new 
paragraph 5, the FHWA proposes to require a maximum height of 7.8 m 
(25.6 ft) to the top of signal housings mounted above the pavement with 
a sliding scale of 6.4 m to 7.8 m (21 to 25.6 ft) maximum height for 
viewing distances between 12 m and 16 m (40 and 53 ft). Vertical 
viewing angles of as high as 23.8 degrees are implicitly allowed via 
the present wording of the MUTCD. This has been identified as a problem 
area. Ergonomic statistics demonstrated that tall motorists, with these 
extreme vertical angle placements, are unable to view the top of the 
signal face due to the blockage from the vehicle ceiling line. 
Therefore the FHWA proposes a maximum vertical viewing angle of 20 
degrees.
    21. In Section 4D.16, the FHWA proposes to revise paragraph 9 (a) 
and (b) to delete the words, ``Left-turn RED ARROW,'' and ``Right-turn 
RED ARROW.'' This would delete the reference to the RED ARROW since 
FHWA proposes to no longer display red arrows on any signal face.
    22. In Section 4D.16, the FHWA proposes to insert a new paragraph 
15 at the end of the section to provide supporting information for 300 
mm (12-in) signals. The new paragraph will read, ``The use of 300 mm 
(12-in) lenses or higher intensity 200 mm (8-in) lenses can be used to 
assist older drivers in decisionmaking tasks further from the 
intersection where traffic density is lower and there are fewer 
potential conflicts with other vehicles.'' The FHWA believes this 
proposed change will assist older drivers in the decisionmaking tasks 
encountered at roadway intersections.
    23. In Section 4D.17, the FHWA proposes to add a new paragraph 16 
to explain the benefits of using a backplate on signals. The FHWA 
believes the use of a backplate will help older drivers and enhance the 
signal conspicuity.

[[Page 73616]]

    24. In Section 4E.4, paragraph 8, the FHWA proposes to revise the 
GUIDANCE as follows: ``For crosswalks where the pedestrian enters the 
crosswalk more than 30 m (100 ft) from the pedestrian signal head 
indications, the symbols should be at least 225 mm (9 in) high.'' The 
MUTCD presently provides that where the pedestrian enters the crosswalk 
more than 20 m (60 ft) from the pedestrian signal head indication, the 
pedestrian symbols should be at least 225 mm (9 in) high. However 
research has found that the lesser, 150 mm (6 in) pedestrian symbols, 
are adequate for distances of up to 30 m (100 ft). The subjects used in 
the research included 48 seniors age 62 and older. The research 
included incandescent, light emitting diode (LED) and Fiber-optic 
pedestrian signals.
    25. The FHWA proposes to add a new Section 4E.6, Accessible 
Pedestrian Signals and a new Section 4E.8, Accessible Pedestrian 
Detectors. In these new sections SUPPORT information would be provided 
on the primary techniques that pedestrians who have visual disabilities 
use to cross the street at signalized intersections. Information would 
also be provided on the availability of local organizations that can 
act as advisors to engineers when consideration is being given to the 
installation of accessible pedestrian signals. GUIDANCE would be 
provided on factors to consider in the engineering study to decide 
whether to install an accessible pedestrian signal. Finally, STANDARDS 
and GUIDANCE would be provided for such installations (if used). These 
would be useful to engineers in designing installations, to suppliers 
by providing a degree of standardization for these devices, and to 
pedestrians who have visual disabilities in assuring that their needs 
are met and that installations of accessible pedestrian signals are 
standardized. Based on this change, the section numbers for 4E.6, 
Pedestrian Signal Timing, would be renumbered as Section 4E.7. Section 
4E.7, Pedestrian Intervals and Phases, would be renumbered as Section 
4E.9.
    26. In redesignated Section 4E.9 (formerly 4E.7), paragraph 4, the 
FHWA proposes to revise the GUIDANCE to change the WALK interval from a 
range of 4 to 7 seconds to a minimum of 7 seconds. In paragraph 9, the 
FHWA proposes to include an OPTION that if pedestrian volumes and 
characteristics do not require a 7-second WALK interval, a WALK 
interval as short as 4 seconds may be used.
    27. In redesignated Section 4E.9 (formerly 4E.7), paragraph 6, the 
FHWA proposes an OPTION that allows the use of new technology for 
pedestrian detection as an alternative to using lower walking speeds 
for slower pedestrians. There has been a successful experiment in 
Portland, Oregon, on the use of passive methods to detect pedestrians 
in the crosswalk.2 Such equipment can detect pedestrians 
that need more time to complete their crossing. The equipment extends 
the length of the pedestrian clearance time (flashing DON'T WALK) for 
that cycle to allow pedestrians to complete their crossing before cross 
traffic begins.
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    \2\ Kloos, W., ``Implementing Passive Methods for Detecting 
Pedestrians,'' presentation at the 1998 Annual Meeting, Institute of 
Transportation Engineers, Washington, DC.
---------------------------------------------------------------------------

    28. In Section 4J.3, paragraph 1, the FHWA proposes to increase the 
minimum height and width dimensions of each DOWNWARD GREEN ARROW, 
YELLOW X, and RED X signal face from 300 mm (12 in) to 450 mm (18 in). 
The FHWA believes this proposed change will ensure that these critical 
signals are adequately conspicuous to capture the drivers' attention. 
The FHWA is also including an OPTION to use 300 mm (12 in) lane-use 
control signal faces in areas having minimal visual clutter and having 
speeds of 70 km/h (45 mph) or less.
    29. The FHWA proposes to add a new Section 4L, In-Roadway Lights, 
to the MUTCD. In-Roadway Lights are special types of highway traffic 
signals. They consist of a series of flashing light units embedded 
across the roadway to warn road users that they are approaching a 
condition on or adjacent to the roadway that might not be readily 
apparent and might require the road users to slow down and possibly 
come to a stop. These conditions include, but are not limited to, 
marked crosswalks that are not controlled by STOP signs, YIELD signs, 
or traffic control signals.
    30. The proposed new Sections 4L.1 and 4L.2 would provide STANDARDS 
and GUIDANCE for the design and operation of In-Roadway Lights (if 
used) installations. The STANDARDS, among other things, would provide: 
(1) For the installation of In-Roadway Lights parallel to the edge of 
the crosswalk, (2) For the operation to be initiated based on 
pedestrian actuation (active or passive), (3) For the operation to 
cease at a predetermined time after the actuation or with passive 
detection when the pedestrian clears the crosswalk, (4) For the 
installation at marked crosswalks only with applicable warning signs, 
and (5) For the height of the In-Roadway Lights not to exceed a height 
of 20 mm (3/4 in).

Rulemaking Analysis and Notices

    All comments received before the close of business on the comment 
closing date indicated above will be considered and will be available 
for examination in the docket at the above address. Comments received 
after the comment closing date will be filed in the docket and will be 
considered to the extent practicable, but the FHWA may issue a final 
rule at any time after the close of the comment period. In addition to 
late comments, the FHWA will also continue to file in the docket 
relevant information that becomes available after the comment closing 
date, and interested persons should continue to examine the docket for 
new material.

Executive Order 12866 (Regulatory Planning and Review) and DOT 
Regulatory Policies and Procedures

    The FHWA has determined preliminarily that this action will not be 
a significant regulatory action within the meaning of Executive Order 
12866 or significant within the meaning of Department of Transportation 
regulatory policies and procedures. It is anticipated that the economic 
impact of this rulemaking would be minimal. The new standards and other 
changes proposed in this notice are intended to improve traffic 
operations and safety, and provide additional guidance, clarification, 
and optional applications for traffic control devices. The FHWA expects 
that these proposed changes will create uniformity and enhance safety 
and mobility at little additional expense to public agencies or the 
motoring public. Therefore, a full regulatory evaluation is not 
required.

Regulatory Flexibility Act

    In compliance with the Regulatory Flexibility Act (5 U.S.C. 601-
612), the FHWA has evaluated the effects of this proposed action on 
small entities. This notice of proposed rulemaking adds some new and 
alternative traffic control devices and traffic control device 
applications. The proposed new standards and other changes are intended 
to improve traffic operations and safety, expand guidance, and clarify 
application of traffic control devices. The FHWA hereby certifies that 
these proposed revisions would not have a significant economic impact 
on a substantial number of small entities.

Unfunded Mandates Reform Act of 1995

    This proposed rule would not impose a Federal mandate resulting in 
the expenditure by State, local, and tribal governments, in the 
aggregate, or by the

[[Page 73617]]

private sector, of $100 million or more in any one year (2 U.S.C. 
1532).

Executive Order 13132 (Federalism)

    This proposed action has been analyzed in accordance with the 
principles and criteria contained in Executive Order 13132 dated August 
4, 1999, and it has been determined that it would not have a 
substantial direct effect or sufficient federalism implications on 
States that would limit the policymaking discretion of the States. 
Nothing in this document directly preempts any State law or regulation.

Executive Order 12372 (Intergovernmental Review)

    Catalog of Federal Domestic Assistance Program Number 20.205, 
Highway Planning and Construction. The regulations implementing 
Executive Order 12372 regarding intergovernmental consultation on 
Federal programs and activities apply to this program.

Paperwork Reduction Act

    This proposed action does not contain a collection of information 
requirement for purposes of the Paperwork Reduction Act of 1995, 44 
U.S.C. 3501 et seq.

Executive Order 12988 (Civil Justice Reform)

    This proposed action meets applicable standards in Sections 3(a) 
and 3(b)(2) of Executive Order 12988, Civil Justice Reform, to minimize 
litigation, eliminate ambiguity, and reduce burden.

Executive Order 13045 (Protection of Children)

    The FHWA has analyzed this proposed action under Executive Order 
13045, Protection of Children from Environmental Health Risks and 
Safety Risks. This is not an economically significant action and does 
not concern an environmental risk to health or safety that may 
disproportionately affect children.

Executive Order 12630 (Taking of Private Property)

    This proposed action would not effect a taking of private property 
or otherwise have taking implications under Executive Order 12630, 
Governmental Actions and Interference with Constitutionally Protected 
Property Rights.

National Environmental Policy Act

    The agency has analyzed this proposed action for the purpose of the 
National Environmental Policy Act of 1969 (42 U.S.C. 4321 et seq.) and 
has determined that it would not have any effect on the quality of the 
environment.

Regulation Identification Number

    A regulation identification number (RIN) is assigned to each 
regulatory action listed in the Unified Agenda of Federal Regulations. 
The Regulatory Information Service Center publishes the Unified Agenda 
in April and October of each year. The RIN contained in the heading of 
this document can be used to cross reference this action with the 
Unified Agenda.

List of Subjects in 23 CFR Part 655

    Design standards, Grant programs--transportation, Highways and 
roads, Incorporation by reference, Signs, Traffic regulations.
(23 U.S.C. 109(d), 114(a), 315, and 402(a); 23 CFR 1.32; 49 CFR 
1.48)

    Issued on: December 17, 1999.
Kenneth R. Wykle,
Administrator.
BILLING CODE 4910-22-P

Manual on Uniform Traffic Control Devices

Introduction

Standard
    Traffic control devices are all signs, signals, markings, and other 
devices used to regulate, warn, or guide traffic, placed on, over or 
adjacent to a street, highway, pedestrain facility, or bikeway by 
authority of a public body or official having jurisdiction.
    The Manual on Uniform Traffic Control Devices (MUTCD) is 
incorporated by reference in 23 Code of Federal Regulations (CFR), 
Parts 655, Subpart F and recognized as the national standard for 
traffic control devices on all roads open to public travel. The 
policies and procedures of the Federal Highway Administration (FHWA) to 
obtain basic uniformity of traffic control devices are described in 23 
CFR 655, Subpart F.
Support:
    The need for uniform standards was recognized long ago. The 
American Association of State and Highway Officials (AASHO), now know 
as the American Association of State Highway and Transportation 
Officials (AASHO) published a manual for rural highways in 1927 and the 
National Conference on Street and Highway Safety (NCSHS) published a 
manual for urban streets in 1930. In the early years, the necessity for 
unification of the standards applicable to the different classes of 
road and street systems was obvious. To meet this need, a joint 
committee of AASHO and NCHSH developed, and published in 1935, the 
original edition of this Manual of Uniform Traffic Control Devices 
(MUTCD). That committee, now called the National Committee on Uniform 
Traffic Control Devices (NCUTDC), though changed from time to time in 
name, organization and personnel, has been in continuous existence and 
has contributed to periodic revisions of the Manual. The FHWA has 
administered the MUTCD since the 1971 edition. The FHWA and its 
predecessor organizations have participated in the development and 
publishing of the previous editions. There were seven previous editions 
of the MUTCD and several additions were revised one or more times. 
Table I-1 traces the evolution of the MUTCD, including two manuals 
developed by AASHO and NCSHS.
    The Secretary if Transportation, under authority granted by 
legislation in 1966, decreed that traffic control devices on all roads 
in each State shall be in substantial conformance with the standards 
issued or endorsed by FHWA.
    23 CFR, Part 655.603 adopts the MUTCD as the national standard for 
any street, highway, or bicycle trail open to public travel. The 
Uniform Vehicle Code (UVC) is one of the referenced documents contained 
in the MUTCD. The UVC contains a model set of motor vehicle and traffic 
laws for use throughout the Nation. As with the MUTCD, the UVC also 
includes language in Section 15-117 which states that, ``No person 
shall install or maintain in any area of private property used by the 
public any sign, signal, marking or other device intended to regulate, 
warn or guide traffic unless it conforms with the State manual and 
specifications adopted under Section 15-104.'' Section 15-104 of the 
UVC adopts the MUTCD as the standard for conformance.

[[Page 73618]]



                         Evolution of the MUTCD
------------------------------------------------------------------------
                                                           Month/year
             Year                        Name                revised
------------------------------------------------------------------------
1927..........................  Manual and              4/29, 12/31
                                 Specifications for
                                 the Manufacture,
                                 Display, and Erection
                                 of U.S. Standard Road
                                 Markers and Signs
                                 (for rural roads).
1930..........................  Manual on Street        No revisions
                                 Traffic Signs,
                                 Signals, and Markings
                                 (for urban streets).
1935..........................  Manual on Uniform       2/39
                                 Traffic Control
                                 Devices for streets
                                 and Highway (MUTCD).
1942..........................  MUTCD--War Emergency    No revisions
                                 Edition.
1948..........................  MUTCD.................  9/54
1961..........................  MUTCD.................  No revisions
1971..........................  MUTCD.................  11/71, 4/72, 3/
                                                         73, 10/73, 6/
                                                         74, 6/75, 9/76,
                                                         12/77
1978..........................  MUTCD.................  12/79, 12/83, 9/
                                                         84, 3/86
1988..........................  MUTCD.................  1/90, 3/92, 9/
                                                         93, 11/94, 12/
                                                         96, 6/98, 6/99
------------------------------------------------------------------------
Table I-1, Evolution of the MUTCD

Part 1. General Provisions

1A.1  Purpose of Traffic Control Devices

Support:
    The purpose of traffic control devices and principles for their use 
is to promote highway safety and efficiency by providing for the 
orderly movement of all road users on streets and highways throughout 
the nation.
    Traffic control devices notify road users of regulations and 
provide warning and guidance needed for the safe, uniform, and 
efficient operation of all elements of the traffic stream.
Standard:
    Traffic control devices or their supports shall not bear any 
advertising message or any other message that is not related to traffic 
control.

1A.2  Principles of Traffic Control Devices

Support:
    This Manual contains the basic principles that govern the design 
and use of traffic control devices for all streets and highways open to 
public travel regardless of type or class or the governmental body 
having jurisdiction. The text specifies the restriction on the use of a 
device if it is intended for limited application or for a specific 
system. It is important that these principles be given primary 
consideration in the selection and application of each device.
Guidance:
    To be effective, a traffic control device should meet five basic 
requirements:
    1. Fulfill a need.
    2. Command attention.
    3. Convey a clear, simple meaning.
    4. Command respect from road users.
    5. Give adequate time for proper response.
    The following aspects of traffic control devices should be 
considered to ensure that these requirements are met: design; placement 
and operation; maintenance; and uniformity.
Support:
    The term speed can mean the 85th percentile, design, average, 
operating, posted or statutory speed. The definitions of these and 
other specified speed terms are contained in Section 1A.14, Definition 
of Words and Phrases.
Guidance:
    The policies and procedures of the FHWA to obtain basic uniformity 
of traffic control devices on all streets and highways are described in 
23 CFR 655 Subpart F. The actions required for road users to obey 
regulatory devices should be specified by state statute, or in cases 
not covered by state statute, by local ordinance or resolution 
consistent with national standards.
    The use of traffic control devices should provide the reasonable 
and prudent road user with the information necessary to safely and 
lawfully use the streets, highways, pedestrian facilities, and 
bikeways. Furthermore, the selection, application, design, placement, 
installation, operation, and maintenance of traffic control devices 
should be based on the minimum capabilities described in the Uniform 
Vehicle Code that a road user must possess to lawfully operate a 
vehicle.
Support:
    Uniformity of the meaning of traffic control devices is vital to 
their effectiveness. The meanings ascribed in devices in this Manual 
are in general accord with the documents mentioned in Section 1A.12.

1A.3  Design of Traffic Control Devices

Guidance:
    Devices should be designed so that such features as size, contrast, 
colors, shape, composition, and lighting or retroreflection are 
combined to draw attention to the devices; that shape, size, colors, 
and simplicity of message combine to produce a clear meaning; that 
legibility and size combine with placement to permit adequate time for 
response; and that uniformity, size, legibility, and reasonableness of 
the message combine to command respect.
Standard:
    All new symbols and sign colors shall be adopted using the 
procedures described in Section 1A.11. All symbols shall be 
unmistakably similar to or mirror images of those shown herein. Symbols 
and colors shall not be modified.
Guidance:
    Other aspects of a device's design should be modified only where 
there is demonstrated need. Modifications should be kept to a minimum 
and should be done in a way that will preserve the essential 
characteristics of the device's appearance.
    Options: State and local highway agencies may develop word message 
signs to notify road users of special regulations or to warn of special 
situations or hazards. Unlike with symbol signs and colors, new word 
message signs may be used without the need for experimentation. With 
the exception of symbols and colors, minor modifications in the 
specific design elements of a device may be made provided the essential 
appearance characteristics are preserved. Although the standard design 
of symbol signs cannot be modified, it may be appropriate to change the 
orientation of the symbol to better reflect the direction of travel.

1A.4  Placement and Operation of Traffic Control Devices

Guidance:
    Placement of the device should assure that it is within the cone of 
vision of the

[[Page 73619]]

viewer so that it will command attention; that it is appropriately 
positioned with respect to the location, object, or situation to which 
it applies to aid in conveying the proper meaning; and that its 
location, combined with suitable legibility, is such that a road user 
has adequate time to make the proper response in both day and night 
conditions.
    Traffic control devices should be placed and operated in a uniform 
and consistent manner to assist road users in properly responding to 
the device, based on their previous exposure to similar traffic control 
situations.
    Unnecessary traffic control devices should be removed. The fact 
that a device is in good physical condition should not be a basis for 
deferring needed replacement or change.

1A.5  Maintenance of Traffic Control Devices

Guidance:
    Functional maintenance of traffic control devices should be 
provided to determine if certain devices need to be changed to meet 
current traffic conditions.
    Physical maintenance of traffic control devices should be performed 
to ensure that legibility is retained, that the device is visible, and 
that it functions properly in relation to other traffic control devices 
in the vicinity.
Support:
    Clean, legible, properly mounted devices in good working condition 
command the respect of road users.

1A.6  Uniformity of Traffic Control Devices

Support:
    Uniformity of devices simplifies the task of the road user because 
it aids in recognition and understanding, thereby reducing perception/
reaction time. It aids road users, police officers, and traffic courts 
by giving everyone the same interpretation. It aids public highway and 
traffic officials through efficiency in manufacture, installation, 
maintenance, and administration. Simply stated, uniformity means 
treating similar situations in the same way. The use of uniform traffic 
control devices does not, in itself, constitute uniformity. A standard 
device used where it is not appropriate is as objectionable as a 
nonstandard device; in fact, this may be worse, because such misuse may 
result in disrespect at those locations where the device is needed.

1A.7  Responsibiloity for Traffic Control Devices

Standard:
    The responsibility for the design, placement, operation, 
maintenance, and uniformity of traffic control devices shall rest with 
the public agency or the official having jurisdiction. 23 CFR 655.603 
adopts the MUTCD as the national standard for all traffic control 
devices installed on any street, highway, or bicycle path open to 
public travel. When a State or other Federal agency MUTCD or supplement 
is required, they shall be in substantial conformance with the national 
MUTCD.
    23 CFR 655.603 also states that traffic control devices on all 
streets and highways open to public travel in each State shall be in 
substantial conformance with standards issued or endorsed by the 
Federal Highway Administrator.
Support:
    The Uniform Vehicle Code has the following provision in Section 15-
104 for the adoption of a uniform Manual:
    ``(a) The [State Highway Agency] shall adopt a manual and 
specification for a uniform system of traffic-control devices 
consistent with the provisions of this code for use upon highways 
within this State. Such uniform system shall correlate with and so far 
as possible conform to the system set forth in the most recent edition 
of the Manual on Uniform Traffic Control Devices for Streets and 
Highways, and other standards issued or endorsed by the Federal Highway 
Administrator.
    ``(b) The Manual adopted pursuant to subsection (a) shall have the 
force and effect of law.''
    Additionally, States are encouraged to adopt Uniform Vehicle Code, 
Section 15-117 which states that, ``No person shall install or maintain 
in any area of private property used by the public any sign, signal, 
marking or other device intended to regulate, warn of guide traffic 
unless it conforms with the State manual and specifications adopted 
under Sec. 15-104.''

1A.8  Placement Authority

Standard:
    Traffic control devices and other signs or messages within the 
highway right-of-away shall be placed only by a public authority or the 
official having jurisdiction, for the purpose of regulating, warning, 
or guiding traffic.
    When the public authority or the official having jurisdiction over 
a street or highway has granted proper authority, others such as 
contractors and public utility companies shall be permitted to install 
temporary traffic control devices. Such traffic control devices shall 
conform to the standards of this Manual.
Guidance:
    Any unauthorized traffic control device or other sign or message 
placed on the highway right-of-way by a private organization or 
individual constitutes a public nuisance and should be removed. All 
unofficial and non-essential signs should be removed.
Standard:
    All regulatory devices shall be supported by laws, ordinances, or 
regulations.
Support:
    Provisions of this Manual are based on the concept that effective 
traffic control depends upon both appropriate application of the 
devices and reasonable enforcement of the regulations.

1A.9  Engineering Study or Judgment Required

Standard:
    This Manual describes the application of traffic control devices, 
but shall not be a legal requirement for their installation, unless so 
stated in any specific section.
Guidance:
    The decision to use a particular device at a particular location 
should be made on the basis of either an engineering study or the 
application of engineering judgment. Thus while this Manual provides 
standards for design and application of traffic control devices, the 
Manual should not be considered a substitute for engineering judgment.
    Qualified engineers should exercise engineering judgment inherent 
in the selection and application of traffic control devices, just as in 
the location and design of the roads and streets which the devices 
complement. Jurisdictions with responsibility for traffic control that 
do not have qualified engineers on their staffs, should seek assistance 
from the State transportation agency, their county, a nearby large 
city, or a traffic engineering consultant.

1A.10  Meaning of STANDARD, GUIDANCE, OPTION, AND SUPPORT

Support:
    The standard, guidance, option, and support material described in 
this edition of the MUTCD provide the engineer with the information 
needed to

[[Page 73620]]

make appropriate decisions regarding the use of traffic control devices 
on streets and highways. This is organized to better differentiate 
between required conditions for traffic control devices (standards) 
that must be satisfied and other conditions (guidance and options) 
which may or may not be applicable, depending upon the particular 
circumstances of a situation.
    Throughout this Manual the headings ``Standard,'' ``Guidance,'' 
``Option,'' and ``Support'' are used to classify the nature of the text 
that follows.
Standard:
    When used in this Manual the headings shall be defined as follows:
    1. Standard: A statement of required, mandatory or specifically 
prohibitive practice regarding a traffic control device. All standards 
are labeled and the headings appear in uppercase, blocked, and bold 
type. The word ``shall'' is typically used. Standards are sometimes 
modified by options.
    2. Guidance: A statement of recommended but not mandatory practice 
in typical situations, with deviations allowed if engineering judgment 
or engineering study indicates the deviation to be appropriate. All 
guidance statements are labeled and the headings appear in uppercase 
shaded type. The word ``should'' is typically used. Guidance statements 
are sometimes modified by options.
    3. Option: A statement of practice which is a permissive condition 
and carries no recommendation or mandate. Options may contain allowable 
modifications to a standard and/or guidance. All option statements are 
labeled and the headings appear in lowercase normal type. The word 
``may'' is typically used.
    4. Support: An informational statement which does not convey any 
degree of mandate, recommendation, authorization, prohibition, or 
enforceable condition. Support statements are labeled and the headings 
appear in uppercase normal type.
Support:
    Figures, tables, and illustrations supplement the text and might 
constitute a Standard, Guidance, Option, or Support. The reader can 
refer to the appropriate text to determine the meaning of the figure, 
table, or illustration.

1A.11  Manual Changes, Interpretations and Authority to Experiment

Standard:
    Use of devices that do not conform to the provisions of this Manual 
shall be prohibited unless the provisions of this section are followed.
Support:
    Continuing advances in technology will produce changes in the 
highway, the vehicle, and in road user proficiency, and portions of the 
system of control devices in this Manual will require updating. In 
addition, unique situations often arise for device applications which 
might require interpretation or clarification of this Manual. It is 
important to have a procedure for recognizing these developments and 
for introducing new ideas and modifications into the system.
Guidance:
    Requests for any change, interpretation or permission to experiment 
should be sent to the Federal Highway Administration (FHWA), Office of 
Transportation Operation (HOTO), 400 Seventh Street, SW., Washington, 
D.C. 20590. The request to experiment may be sent directly to HOTO with 
a copy to the FHWA Division Office or the request may be sent to the 
FHWA Division Office and then forwarded to HOTO. Diagrams showing the 
process for changes to the MUTCD and experimentation with traffic 
control devices are included after this section.
    1. Change--A change includes consideration of new devices to 
replace a present standard device, additional devices to be added to 
the list of standard devices, or revisions to recommended application 
or meaning criteria.
    Request for a change in the Manual should contain the following 
information:
    (a) A statement indicating what change is proposed.
    (b) Any illustration which would be helpful to understand the 
request.
    (c) Any supporting research data which is pertinent to the item to 
be reviewed.
    2. Interpretation--An interpretation includes application and 
operation of standard traffic control devices, official meanings of 
standard traffic control devices, or variations from standard device 
designs.
    Requests for an interpretation of the Manual should contain the 
following information:
    (a) A concise statement of the interpretation being sought.
    (b) A description of the condition which provoked the need for an 
interpretation.
    (c) Any illustration which would be helpful to understand the 
request.
    (d) Any supporting research data which is pertinent to the item to 
be interpreted.
    3. Experiment--Requests to experiment include consideration of 
testing or evaluating a new traffic control device, its application or 
manner of use, or a provision not specifically described in this 
Manual.
    Request for permission to experiment will be considered only when 
submitted by the governmental agency or private toll facility 
responsible for the operation of the road or street on which the 
experiment is to take place and should contain the following:
    (a) A statement indicating the nature of the problem.
    (b) A description of the proposed change, how it was developed, the 
manner in which it deviates from the standard, and how it is expected 
to be an improvement over existing standards.
    (c) Any illustration which would be helpful to understand the 
experimental device or use of the device.
    (d) Any supporting data explaining how the experimental device was 
developed, if it has been tried, in what way it was found to be 
adequate or inadequate, and how this choice of device or application 
was derived.
    (e) A detailed research or evaluation plan including the time 
period and location(s) of the experiment. This plan must also provide 
for close monitoring of the experimentation, especially in the early 
stages of its field implementation.
    (f) An agreement to restore the experiment site to a condition 
which complies with the provisions of the Manual within 3 months 
following the end of the time period of the experiment. This agreement 
must also provide that the agency sponsoring the experimentation will 
terminate the experimentation at any time that it determines 
significant safety hazards are directly or indirectly attributable to 
the experimentation. The Office of Transportation Operations may also 
terminate approval of the experimentation at any time if there is an 
indication of hazards. If, as a result of the experimentation, a 
request is made that the Manual be changed to include the device or 
application being experimented with, the device or application may 
remain in place until an official rulemaking action has occurred.
    (g) An agreement to provide semiannual progress reports for the 
duration of the experimentation and to provide a copy of the final 
results of the experimentation to the Office of Transportation 
Operations (HOTO), within 3 months following completion

[[Page 73621]]

of the experimentation. The Office of Transportation Operations may 
terminate approval of the experimentation if reports are not provided 
in accordance with this schedule.
Support:
    Procedures for revising the Manual are set out in the Federal 
Register of June 30, 1983, (48 FR 30145).
    For additional copies of information concerning changes, 
interpretations, or experimentation, write to the FHWA (HOTO), 400 
Seventh Street, SW., Washington, D.C. 20590.

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[[Page 73622]]

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[[Page 73624]]

1A.12  Relation to Other Documents

Support:
    Two publications by the National Committee on Uniform Traffic Laws 
and Ordinances are specifically designed to provide the content and 
language of legislation needed to give regulatory devices the same 
meaning in all jurisdictions. These are the Uniform Vehicle Code and 
the Model Traffic Ordinance. Both the Code and the Ordinance require 
the placing of signs or other traffic control devices to make some of 
their provisions effective, and both define the legal meaning of 
certain devices. The Code directs State authorities to adopt a manual 
for a uniform system of traffic control devices, and requires all 
devices to conform thereto. The Ordinance also requires municipalities 
or other local governments to conform with the State manual for traffic 
control devices. The adoption of appropriate legislation is an 
essential step toward uniformity.
Standard:
    To the extent they are incorporated by specific reference, the 
latest editions of the following documents, or those editions 
specifically noted, shall be a part of this Manual:
``Standard Alphabets for Highway Signs and Pavement Markings,'' FHWA
``Standard Color Tolerance Limits,'' FHWA
``Standard Highway Signs,'' FHWA
``Vehicle Traffic Control Signal Heads,'' Institute of Transportation 
Engineers (ITE)
``Pedestrian Traffic Control Signal Indications,'' ITE
``Purchase Specification for Flashing and Steady Burn Warning Lights,'' 
ITE
``Traffic Signal Lamps,'' ITE
``Uniform Vehicle Code'' and ``Model Traffic Ordinance'', National 
Committee on Uniform Traffic Laws and Ordinances.
Support:
    Other documents that are useful sources of information with respect 
to utilization of these standards include:
``Traffic Engineering Handbook'', ITE
``Highway Capacity Manual,'' Transportation Research Board (TRB)
``A Policy on Geometric Design of Highway and Streets,'' American 
Association of State Highway and Transportation Officials (AASHTO)
``Guidelines for the Selection of Supplemental Guide Signs for Traffic 
Generators Adjacent to Freeways, (AASHTO)
List of Control Cities for Use in Guide Signs on Interstate Highways,'' 
ASSHTO
``Manual on Traffic Engineering Studies,'' ITE
``Manual of Transportation Engineering Studies,'' ITE
``Roadside Design Guide,'' AASHTO
``School Trip Safety Program Guidelines,'' ITE
``Manual of Traffic Signal Design,'' ITE
``Traffic Signal Installation and Maintenance Manual,'' ITE
``Traffic Detector Handbook,'' ITE
``Signal Manual of Recommended Practice,'' Association of American 
Railroads (AAR)

1A.13  Color Code

Support:
    The following color code establishes general meanings for eight 
colors of a total of twelve colors that have been identified as being 
appropriate for use in conveying traffic control information. Central 
values and tolerance limits for each color are available from the 
Federal Highway Administration (HOTO), 400 Seventh Street SW., 
Washington, D.C. 20590.
    The three colors for which general meanings have not yet been 
assigned are being reserved for future applications that will be 
determined only by FHWA after consultation with the States, the 
engineering community, and the general public. The meanings described 
in this Section are of a general nature. More specific assignments of 
colors are given in the individuals Parts of this Manual relating to 
each class of devices.
Standard:

 
 
 
 
    YELLOW.............................  General warning
    RED................................  Stop or prohibition
    BLUE...............................  Road user services guidance,
                                          Tourist information, and Civil
                                          defense evacuation route
    GREEN..............................  Indicated movements permitted,
                                          direction guidance
    BROWNn.............................  Recreational and cultural
                                          interest guidance
    ORANGE.............................  Temporary traffic control
    BLACK..............................  Regulation
    WHITE..............................  Regulation
    FLOURESCENT YELLOW-GREEN...........  Pedestrian, Bicycle, School
                                          Warning
    PURPLE.............................  Unassigned
    LIGHT BLUE.........................  Unassigned
    CORAL..............................  Unassigned
 

1A.14  Defintiions of Words and Phrases

Standard:
    All words and phrases uses in this Manual shall have the meaning 
described herein. Unless otherwise defined herein, or in the other 
parts of this Manual, definitions contained in the most recent edition 
of the Uniform Vehicle Code, AASHTO Transportation Glossary (Highway 
Definitions), and other documents specified in Section 1A.12 are also 
incorporated and adopted by reference.
    When definitions vary from UVC and AASHTO Glossary, the MUTCD 
definition shall be followed. Definitions included in this section are 
for items that are used throughout the MUTCD. If a term is used only in 
one specific part of the Manual (i.e., Signals), then the definition 
will appear in that specific part of the Manual.
    85th percentile speed.--The speed at or below which eighty-five 
percent of the motorized vehicles travel.
    Active highway-rail grade crossing warning system.--The flashing 
signals, with or without traffic gates, together with the necessary 
control equipment used to inform road users of the approach or presence 
of trains at the grade crossing.
    Advisory speed.--A recommended maximum speed for all typical 
vehicles operating on a section of highway and based on an engineering 
study of the highway design and operating characteristics.
    Approach.--All lanes of traffic moving towards an intersection or a 
mid-block location from one direction, including any adjacent parking 
lane(s).
    Arterial highway (street).--A general term denoting a highway 
primarily use by through traffic, usually on a continuous route or a 
highway designated as part of an arterial highway system.
    Average day.--A day representing traffic volumes normally and 
repeatedly found at a location, typically a weekdays when volumes are 
influenced by employment or a weekend day when volumes are influenced 
by entertainment or recreation.
    Average speed.--The summation of the distances traveled divided by 
the summation of the time in motion to traverse the distances for all 
vehicles. Also may be the summation of the measured speeds of vehicles 
divided by the number of vehicles observed.
    Bicycle.--A pedal-powered vehicle upon which the human operator 
sits.
    Bicycle path.--A separate trail or path from which motor vehicles 
are prohibited and which is for the

[[Page 73625]]

exclusive use of bicycles or the shared use of bicycles and 
pedestrians. Where such trail or path forms a part of a highway, it is 
separated from the roadways for motor vehicle traffic by an open space 
or barrier.
    Bicycle route.--A system of bikeways designated by appropriate 
route makers, and by the jurisdiction having authority.
    Bikeway.--Any road, street, path, or way which in some manner is 
specifically designated as being open to bicycle travel, regardless of 
whether such facilities are designated for the exclusive use of 
bicycles or are to be shared with other transportation modes.
    Center line markings.--The yellow pavement marking line(s) that 
delineate the separation of traffic lanes which have opposite 
directions of travel on a roadway. These markings need not be at the 
geometrical center of the pavement.
    Changeable message sign.--A sign with the flexibility to display 
various messages.
    Channelizing line markings.--White pavement marking lines that 
define the neutral area, direct existing traffic at the proper angle 
for smooth divergence into the ramp, and reduce the probability of 
collision with objects adjacent to the roadway.
    Collector highway.--A term denoting a highway which in rural areas 
connects small towns and local highways to arterial highways, and in 
urban areas provides land access and traffic circulation within 
residential, commercial and business areas and connects local highways 
to the arterial highways.
    Crosswalk.--(a) That part of a roadway at an intersection included 
within the connections of the lateral lines of the sidewalks on 
opposite sides of the highway measured from the curbs or in the absence 
of curbs, from the edges of the traversable roadway, and in the absence 
of a sidewalk on one side of the roadway, the part of a roadway 
included within the extension of the lateral lines of the sidewalk at 
right angles to the centerline.
    (b) Any portion of a roadway at an intersection or elsewhere 
distinctly indicated for pedestrian crossing by lines or other markings 
on the surface.
    Crosswalk lines.--White pavement marking lines that mark both edges 
of a crosswalk.
    Design speed.--A speed determined by the design and correlation of 
the physical features of a highway that influence vehicle operation.
    Edge line markings.--White or yellow pavement marking lines that 
delineates the right or left edge(s) of a travel way.
    End of roadway marker.--A device used to warn and alert road users 
of the end of a roadway in other than construction or maintenance 
areas.
    Engineering judgment.--The evaluation of available pertinent 
information, and the application of appropriate principles, standards, 
guidance, and practice as contained in this Manual and other sources, 
for the purpose of deciding upon the applicability, design, operation, 
or installation of a traffic control device. Engineering judgment shall 
be exercised by an engineer, or by an individual working under the 
supervision of an engineer, through the application of procedures and 
criteria established by the engineer. Documentation of engineering 
judgment is not required.
    Engineering study.--The comprehensive analysis and evaluation of 
available pertinent information, and the application of appropriate 
principles, standards, guidance, and practice as contained in this 
Manual and other sources, for the purpose of deciding upon the 
applicability, design, operation, or installation of a traffic control 
device. An engineering study shall be performed by an engineer, or by 
an individual working under the supervision of an engineer, through the 
application of procedures and criteria established by the engineer. An 
engineering study shall be documented.
    Flashing (flashing mode).--A mode of operation in which a traffic 
signal indication is turned on and off repetitively.
    Flashing beacon.--A highway traffic signal with one or more signal 
sections that operates in a flashing mode.
    Guide signs.--A sign that shows route designations, destinations, 
directions, distances, services, points of interest, or other 
geographical, recreational, or cultural information.
    Highway-rail grade crossing (roadway-rail intersection).--The 
general area where a highway and a railroad cross at the same level, 
within which are included the railroad, roadway and roadside facilities 
for traffic traversing that area.
    Highway, road, or street.--General terms denoting a public way for 
purposes of travel, including the entire area within the right-of-way.
    Highway traffic signal.--A power-operated traffic control device by 
which traffic is warned or directed to take some specific action. These 
devices do not include power-operated signs, barricade warning lights, 
or steady burning electric lamps.
    Intersection.--(a) The area embraced within the prolongation or 
connection of the lateral curb lines, or if none, the lateral boundary 
lines of the roadways of two highways that join one another at, or 
approximately at, right angles, or the area within which vehicles 
traveling on different highways that join at any other angle may come 
into conflict.
    (b) If a highway includes two roadways 9 meters (30 ft) or more 
apart, then every crossing of each roadway of such divided highway by 
an intersecting highway shall be regarded as a separate intersection. 
If the intersecting highway also includes two roadways 9 meters (30 ft) 
or more apart, then every crossing of two roadways of such highways 
shall be regarded as a separate intersection.
    (c) The junction of an alley or driveway with a roadway or highway 
shall not constitute an intersection
    Island.--A defined area between traffic lanes for control of 
vehicular movements or for pedestrian refuge. Within an intersection 
area, a median or an outer separation is considered to be an island.
    Lane line markings.--The white pavement marking lines(s) that 
delineate the separation of traffic lanes that have the same direction 
of travel on a roadway.
    Lane-use control signal.--An overhead signal face displaying 
indications to permit or prohibit the use of specific lanes of a 
roadway or to indicate the impending prohibition of such use.
    Major roadway.--The roadway normally carrying the higher volume of 
vehicular traffic.
    Median.--Area between two roadways of a divided highway measured 
from edge of traveled way to edge of traveled way. The median excludes 
turn lanes. The median width may be different between intersections, 
and at opposite approaches of the same intersection.
    Minor roadway.--The roadway normally carrying the lower volume of 
vehicular traffic.
    Roadway network.--A geographical arrangement of intersecting 
roadways.
    Object markers.--Devices used to mark obstructions within or 
adjacent to the roadway.
    Operating speed.--A speed at which a typical vehicle or the overall 
traffic operates. May be defined with speed values such as the average, 
pace, or 85th percentile speeds.
    Pace speed.--The highest speed within a specific range of speeds 
which represents more vehicles than in any other like range of speed. 
The range of speeds typically used is 10 mph.
    Paved.--A bituminous surface treatment, mixed bituminous concrete, 
or portland cement concrete roadway surface which has both a structural 
(weight bearing) and a sealing purpose for the roadway.

[[Page 73626]]

    Pedestrian.--A person afoot, in a wheelchair, on skates, or on a 
skateboard.
    Platoon.--A group of vehicles or pedestrians traveling together as 
a group, either voluntarily or involuntarily, because of traffic signal 
controls, geometrics, or other factors.
    Posted speed.--A speed limit displayed on a traffic control device.
    Preferential bicycle lane.--A portion of a roadway or shoulder 
which has been designated for use by bicyclists. It is distinguished 
from the portion of the roadway for motor vehicle traffic by a paint 
stripe, curb, or other similar device.
    Preferential lane marking.--Consists of white lines formed in a 
diamond shape.
    Pretimed operation.--A type of controller unit operation during 
which the length of various intervals remains constant.
    Raised pavement marker.--A device with a height of at least 10 mm 
(0.4 inch), mounted on or in a road surface and intended to supplement 
or substitute for pavement markings.
    Regulatory signs.--A sign that gives notice of traffic laws or 
regulations.
    Resistance gate (second gate).--A type of traffic gate located 
downstream of the moveable bridge warning gate which may provide a 
physical barrier to vehicle and/or pedestrian traffic when placed in 
the appropriate position. Additional information is contained in the 
AASHTO Standard Specifications for Moveable Highway Bridges.
    Retroreflectivity.--The return of a point source illumination from 
a surface to its origin.
    Right-of-way [assignment].--Permitting vehicles and/or pedestrians 
to proceed in a lawful manner in preference to other vehicles or 
pedestrians by the display of signal indications.
    Road (see roadway).
    Road delineators.--Retroreflective devices mounted above the 
roadway surface and at the side of the roadway in a series to indicate 
the alignment of the roadway.
    Road user.--A vehicle operator, bicyclist, or pedestrian within the 
highway.
    Roadway.--That portion of a highway improved, designed, or 
ordinarily used for vehicular travel, exclusive of the sidewalk, berm, 
or shoulder even though such sidewalk, berm or shoulder is used by 
persons riding bicycles or other human-powered vehicles. In the event a 
highway includes two or more separate roadways, the term ``roadway'' as 
used herein shall refer to any such ``roadway'' separately but not to 
all such roadways collectively. Roadway includes parking lanes.
    Roadway-rail intersection (see highway-rail grade crossing.
    Rural.--A type of roadway defined by the jurisdiction in compliance 
with their legislation, statute, regulations, and policies.
    Second gate (see resistance gate).
    Semi-actuated operation.--A type of operation of a controller unit 
in which one or more, but not all, signal phases do not function on 
basis of actuation.
    Shared roadway.--A roadway which is officially designated and 
marked as a bicycle route, but which is open to motor vehicle travel 
and upon which no bicycle lane is designated.
    Sidewalk.--That portion of a street between the curb line, or the 
lateral line of a roadway, and the adjacent property line, intended for 
use by pedestrians.
    Sign illumination.--Either internal or external lighting that shows 
the same color day or night. Street, highway, or strobe lighting shall 
not be considered as meeting this definition.
    Sign legend.--All word messages, borders, logos, and symbol designs 
that are intended to convey specific meanings.
    Signal face.--Front part of a signal head.
    Signal head.--An assembly of one or more signal faces together with 
the associated signal housings.
    Signal housing.--That part of a signal section that protects the 
light source and other required components.
    Signal indication.--The illumination of a signal lens or equivalent 
device or a combination of several lenses or equivalent devices at the 
same time.
    Signal installation.--The traffic signal equipment, signal heads 
and their supports, and associated electrical circuitry at a particular 
location.
    Speed.--The 85th percentile, design, average, operating, posted or 
statutory speed as defined by the road authority for the engineering 
application.
    Speed limit.--The maximum (or minimum) speed applicable to a 
section of highway as established by law.
    Speed measurement marking.--A white transverse pavement marking 
placed on the roadway to assist the enforcement of speed regulations.
    Speed zone.--A section of highway with a speed limit which is 
established by law but which is different form a legislatively 
specified statutory speed limit. Often established by administrative 
action as permitted by law.
    Statutory speed.--A speed limit established by legislative action 
which typically is applicable for highways with specified design, 
functional, jurisdictional and/or location characteristic.
    Stop line.--A solid white pavement marking line extending across 
approach lanes to indicate the point at which a stop is intended or 
required to be made.
    Street (see roadway).
    Traffic.--Pedestrains, ridden or herded animals, vehicles, 
streetcars, and other conveyances either singularly or together while 
using any highway for purposes of travel.
    Traffic control devices.--All signs, signals, markings, islands, 
and other devices used to regulate, warn, or guide traffic, placed on, 
over, or adjacent to a street, highway, road, pedestrian facility, or 
bicycle path by authority of a public body or official having 
jurisdiction.
    Traffic control signal (traffic signal).--Any highway traffic 
signal by which traffic is alternately assigned the right-of-way to the 
various movements at an intersection or other roadway location.
    Train.--A locomotive or self-propelled unit which is assigned a 
train number, which operates on fixed rails or tracks and to which all 
other traffic must yield the right-of-way by law.
    Transverse markings.--Pavement markings that include shoulder 
markings, word and symbol markings, stop liens, crosswalk lines, speed 
measurement markings, parking space markings, and others.
    Traveled way.--The portion of the roadway for the movement of 
vehicles, exclusive of the shoulders, berms, sidewalks, and parking 
lanes.
    Urban.--A type of roadway as defined by the jurisdictions in 
compliance with their legislation, statute, regulations, and policies.
    Vehicle.--Every device in, upon, or by which any person or property 
may be transported or drawn upon a highway, except trains. A light rail 
car operating on a roadway, to which other traffic is not required to 
yield the right-of-way by law, is vehicle.
    Warning gate.--A type of traffic gate designed to warn, but not to 
primarily provide a physical barrier to, vehicle and/or pedestrian 
traffic when placed in the appropriate position.
    Warning sign.--A sign that calls attention to conditions on a 
adjacent to a highway or street that present a situation that may not 
be readily apparent to the road user.
    Warrant.--A warrant describes threshold conditions to the engineer 
in evaluating the potential safety and operational benefits of traffic 
control devices and is based upon ``average'' or ``normal'' conditions. 
Warrants are not a substitute for engineering judgment. The fact that a 
warrant for a particular traffic

[[Page 73627]]

control device is met is not conclusive justification for the 
installation of the device.
    Wrong-way arrows.--Slender, elongated, white pavement marking 
arrows placed upstream from the ramp terminus to indicate the correct 
direction of traffic flow. They are intended primarily to warn wrong-
way road users that they are going in the wrong direction.

1.A.15  Abbreviations

Standard:
    The following are standard abbreviations for word messages used in 
connection with traffic control devices:
ON SIGNS
    ALT = alternate
    AM = morning
    AVE = avenue
    BIKE = bicycle
    BLVD = boulevard
    CB = CB Radio
    CD = civil defense
    CYCLES = 2-wheeled vehicles
    D = diesel fuel
    DR = drive
    E = east
    EV = electric vehicle
    EXEMPT = stop at highway-rail grade crossing not required by some 
types of vehicles
    FM = FM radio
    FT = feet
    H = hospital
    HR = hour
    INFO = information
    JCT = junction/intersection
    KM = kilometers
    KM/HR = kilometers per hour
    LN = lane
    LBS = pounds
    LP-GAS = liquid propane gas
    LUGS = tires with lugs
    M = meters
    MIN = minutes
    MI = miles
    MON-FRI = days of week
    M.P.H. = miles per hour
    NAT'L = national
    N = north
    P = parking
    PED = pedestrian
    PHONE = telephone
    PM = afternoon/night
    R.R. = highway-rail grade crossing
    ST = street
    T = tons of weight
    US = state numbered route
    2-WAY = two way intersection
    - = to
    & = and
    ? = information
    % = percent
    `` = inches
    ` = feet

PAVEMENT MARKINGS
    MPH = miles per hour
    PED = pedestrian
    RXR = highway-rail grade crossing
    US = state numbered route
    XING = crossings other than highway-rail grade

ON SIGNALS
    DONT = do not

3B.  Pavement and Curb Markings

3B.1  Yellow Longitudinal Line Markings

    A. Center Line Markings
Standard:
    Center line markings, when used, shall be the pavement markings 
used to delineate the separation of traffic lanes which have opposite 
directions of travel on a roadway. These markings need not be placed at 
the geometrical center of the roadway.
    Option: On roadways without a continuous center line marking, short 
sections may be marked with center line to control the position of 
traffic at specific locations, (e.g. around curves, over hills, on 
approaches to roadway-rail intersections, at roadway-rail intersections 
and at bridges.)
Standard:
    The center line markings on two-lane, two-way roadways shall be one 
of the following as shown in Figure 3-1:
     Broken center line markings consisting of a normal broken 
yellow line where crossing the centerline markings for passing with 
care is permitted for traffic traveling in each direction.
     One-direction no-passing zone markings consisting of a 
normal broken yellow line and a normal solid yellow line where crossing 
the center line markings for passing with care is permitted for the 
traffic traveling adjacent to the broken line but is prohibited for 
traffic traveling adjacent to the solid line.
     Two-direction no-passing zone markings consisting of two 
normal solid yellow lines where crossing the centerline markings for 
passing is prohibited for traffic traveling in each direction.
Standard:
    The center line markings one two-ways roadways with four or more 
traffic lanes always available, shall be the two-directions no-passing 
zone markings as shown in Figures 3-2 and 3-3.
Guidance:
    On two-way roadways with three traffic lanes, two lanes should be 
designated for traffic in one direction by using one- or two-direction 
no-passing zone markings as shown in Figure 3-4.
Standard:
    Center line markings shall be placed on paved two-way traveled ways 
on streets and highways having one or more of the following 
characteristics.
    (a) All urban and rural arterials and collectors that have a 
roadway of 6 m (20 ft) or more in width with an ADT of 6000 or greater.
    (b) All urban and rural highways that have three or more traffic 
lanes.
Guidance:
    Center line markings should be place on the paved, two-way traveled 
ways on streets and highways having the following characteristics:
     Urban arterials and collectors that have a roadway 6 m (20 
ft) or more in width with an ADT of 4000 or greater.
     All rural arterials and collectors that have a roadway of 
5.5 m (18 ft) or more in width with an ADT of 3000 or greater.
    An engineering study should be used in determining whether to place 
center line markings on a traveled way less than 4.8 m (16 ft) wide due 
to traffic encroaching on the pavement edges, traffic being affected by 
parked vehicles, and due to traffic encroachment into the lane of 
opposing traffic where edge line markings are used.
    Option: Center line markings may be placed on other two-way 
roadways 4.8 m (16 ft) or more in width.
    B. No-Passing Zone markings
Standard:
    A no-passing zone shall be marked by either the one direction no-
passing zone markings or the two-direction no-passing zone markings 
described above and shown in Figures 3-1b, 3-2, 3-3, and 3-4.
    When center line markings are used, the no-passing zone marking 
shall be used on two-way roadways at lane reduction transitions 
(Sections 3B.5) and on approaches to obstructions that must be passed 
on the right (Section 3B.6).
Guidance:
    Where the distance between successive no-passing zones is less than 
120 m (400 ft), no-passing markings should connect the zones.
    Option: In addition to the pavement markings herein prescribed, no-
passing zone signs (Section 2B.21, 2B.22, 2C.38) may be used to 
emphasize the existence and extent of a no-passing zone.
Support:
    Specific reference is made to Section 11-307 UVC Revised.

[[Page 73628]]

Standard:
    On two-way, two- or three-lane roadways where center line markings 
are installed, no-passing zones shall be established as follows:
    (1) at vertical and horizontal curves and other locations where an 
engineering study indicates passing must be prohibited because of 
inadequate sight distances or there special conditions.
    (2) with the no-passing zone markings extended throughout the no-
passing zone.
    (3) on three-lane roadways where two lanes from each direction of 
travel transition to become one lane for each direction of travel, a 
median island shall be provided in the center lane. The median island 
shall consist of a lane transition at each end of a buffer zone and 
shown in Figure 3-5.
Guidance:
    For roadways having a posted or statutory speed limit of 70 KM/H 
(45 mph) or greater, the transition taper length should be computed by 
the formula L = 0.62WS (L=WS).
    For roadways having a posted or statutory speed limit of 60 KM/H 
(40 mph) or less, the taper length should be computed by the formula 
L=WS\2\/155 (L=WS\2\/60). Under both formulas, L equals the taper 
length in meters (feet), W equals the width of the center lane in 
meters (feet), and S equals the posted or statutory speed limiting in 
kilometers (miles) per hours.
    The minimum taper length of the lane transitions shall be 30 m (100 
ft) in urban areas and 60 m (200 ft) in rural areas.
Standard:
    On roadways with center line markings, a no-passing zone marking 
shall be used at a horizontal or vertical curve where the sight 
distance is less than the minimum necessary for safe passing at the 
posted or statutory speed limit a s shown in Table 3-1, Passing sight 
distance on a vertical curve is the distance at which an object 1.07 m 
(3.50 ft) above the pavement can be seen by an approaching driver 
(Figure 3-6a). Similarly, passing sight distance on a horizontal curve 
is the distance measured along the center line (or right hand lane line 
of a three-lane highway) between two points 1.07 m (3.50 ft) above the 
pavement on a line tangent to the embankment or other obstruction that 
cuts off the view on the inside of the curve (Figure 3-6b).

               Table 3-1. Minimum Passing Sight Distances
------------------------------------------------------------------------
            Posted or Statutory Speed Limit              Minimum Passing
-------------------------------------------------------  Sight Distance
                                                       -----------------
                     km/h                        mph     meters    feet
------------------------------------------------------------------------
40...........................................       25      140      450
50...........................................       30      160      500
60...........................................       35      180      550
a............................................       40  .......      600
70...........................................       45      210      700
80...........................................       50      245      800
90...........................................       55      280      900
100..........................................       60      320    1,000
110..........................................       65      355    1,100
120..........................................       70      395    1,200
------------------------------------------------------------------------

Support:
    The beginning of a no-passing zone at point ``a,'' in Figure 3-6 is 
that point where the sight distance first becomes less than that 
specified in Table 3-1. The end of the no-passing zone at point ``b'' 
in Figure 3-6 that point at which the sight distance again becomes 
greater than the minimum specified.
    C. Reversible Lane Line Markings
Standard:
    The reversible lane line markings shall consist of two normal 
broken double yellow lines to delineate the edges of a lane in which 
the direction of travel is changed from time to time in such a way that 
these markings serve as the center line markings of the roadway during 
some period. Signs, signals, or both shall be used to supplement these 
pavement markings as shown in Figure 3-7.
    D. Two-Way Left Turn Lane Markings
Standard:
    The two-way left turn lane markings shall consist of a normal 
broken yellow line and a normal solid yellow line to delineate both 
edges of a two-way left turn lane which may be used by traffic for part 
of a left turn maneuver. These markings shall be placed with the broken 
line toward the two-way left turn lane and the solid line toward the 
adjacent traffic lane as show in Figure 3-3a. Traffic adjacent to the 
solid line may cross such markings with care only as part of a left 
turn maneuver.
    Option: Pavement marking arrows may be used in conjunction with the 
two-way left turn markings as shown in Figure 3-3a.
Guidance:
    Signs should be used in conjunction with the two-way left turn 
markings (Section 2B.19).
    E. Median Islands Formed by Pavement Markings
Standard:
    Two double solid yellow lines shall be used to form continuous 
median islands where these islands separate travel in opposite 
directions as shown in Figures 3-2b and 3-5. Other markings in the 
median island area shall be yellow, except crosswalk markings which 
shall be white (Section 3B.8).
    F. Left Edge Line Markings
Standard:
    The left edge line markings shall consist of a normal solid yellow 
line to delineate the left edge of a roadway, or to indicate driving or 
passing restrictions left of these markings on the roadways of divided 
and one-way highways and on any ramp in the direction of travel 
(Section 3B.3).

3B.2  White Longitudinal Line Markings

    A. Lane Line Markings
Standard:
    Lane line markings when used, shall be the pavement markings used 
to delineate the separation of traffic lanes that have the same 
direction of travel.
Support:
    Typical applications of lane line markings are shown in Figures 3-1 
through 3-6, 3-8 through 3-13, 3-20, and 3-21.
Standard:
    The broken white lane line markings shall consist of a normal 
broken white line where crossing the lane line markings with care is 
permitted.
Standard:
    The solid lane line markings shall consist of a normal solid white 
line where crossing the lane line markings is discouraged.
    Option: Solid white lane line markings may be used to separate 
through traffic lanes from auxiliary lanes, such as uphill truck lanes, 
left or right turn lanes and preferential lanes. They may also be used 
to separate traffic lanes approaching an intersection. Wide solid lane 
line markings may be used for greater emphasis.
Standard:
    Double solid lane markings shall consist of two normal solid white 
lines where crossing the lane line markings is prohibited.
Standard:
    Lane line markings shall be used on all Interstate highways and 
freeways.

[[Page 73629]]

Guidance:
    Lane line markings should be used at the following locations:
    (a) on all roadways with 2 or more adjacent traffic lanes that have 
the same direction of travel,
    (b) at congested locations where the roadway will accommodate more 
traffic lanes with lane line markings than without the markings.
Standard:
    The channelizing line shall be a wide or double solid white line. 
Other markings in the island area shall be a normal solid white line.
    Option: The channelizing line may be used to form islands where 
traffic with the same direction of travel is permitted on both sides of 
the island.
Support:
    Typical examples of channelizing line applications are shown in 
Figures 3-2, 3-3, 3-8, 3-9, 3-11, 3-12, 3-13c, and 3-20.
    C. Interchange Ramp Markings
Support:
    Channelizing lines at exit ramps as shown in Figure 3-11, define 
the neutral area, direct existing traffic at the proper angle for 
smooth divergence into the ramp, and reduce the probability of 
colliding with objects adjacent to the roadway.
    Channelizing lines at entrance ramps as shown in Figure 3-12, 
promote safe and efficient merging with the through traffic.
Standard:
    For exit ramps, channelizing lines shall be placed along the sides 
of the neutral area adjacent to the through traffic lane and the ramp 
lane. With a parallel deceleration lane, a lane line shall be extended 
from the beginning of the channelizing line upstream for a distance of 
one-half the length of the full-width deceleration lane.
    Option: White transverse markings may be placed in neutral area for 
special emphasis, as shown in Figures 3-11a,b, and 3-12c.
Guidance:
    For entrance ramps, a channelizing line should be placed along the 
side of the neutral area adjacent to the ramp lane.
    On entrance ramps with a parallel acceleration lane, or lane line 
should be extended from the end of the channelizing line for a distance 
one-half the length of the full width acceleration lane, as should in 
Figure 3-12a.
    Option: With a tapered acceleration lane, lane line markings may be 
placed to extend the channelizing line, but not beyond a point where 
the tapered lane meets the near side of the through traffic lane, as 
shown in Figure 3-12b.
    Lane drop markings as shown in Figure 3-11c may be used in advance 
of lane drops at exit ramps to distinguish a lane drop from a normal 
exit ramp or from an auxiliary lane. The lane drop marking may consist 
of a wide, white dotted line with segments 900 mm (3ft) in length 
separated by 3.6 m (12ft) gaps.
Guidance:
    If used, lane drop markings should begin 800 m (0.5 mi) in advance 
of the theoretical gore point.
    Option: Where lane changes might cause conflicts, a wide solid 
white channelizing line may extend upstream from the theoretical gore 
point.
Support:
    Pavement marking arrow use for wrong-way traffic is included in 
Section 3B.12.
    D. Right Edge Line Markings
Standard:
    The right edge line markings shall consist of a normal solid white 
line to delineate the right edge of the roadway (Section 3B.3).

3B.3  Edge Line Markings

Standard:
    Edge line markings are those markings which delineate the right or 
left edges of a roadway (Sections 3B.1 and 3B.2).
    Edge line markings shall not be continued through intersections.
Guidance:
    Edge line markings should not be broken for driveways.
Support:
    Edge line markings have unique value as visual references to guide 
road users during adverse weather and visibility conditions.

Edge Line Marking Warrants

Standard:
    Edge line markings shall be placed on the paved traveled ways on 
streets and highways with the following characteristics:
     freeways
     expressways
     rural arterials with a roadway 6 m (20 ft) or more in 
width with and ADT of 6000 or greater.
Guidance:
    Edge line markings should be placed on the paved roadways of the 
following highways:
     Rural collectors with a roadway 6 m (20 ft) or more in 
width and where the edge of the roadway is not otherwise delineated 
with curbs or other pavement markings such as for parking.
     Other paved streets and highways where an engineering 
study indicates a need.
    Option: Edge line markings may be placed on highways with or 
without center line markings. They may be excluded based on engineering 
judgment where the traveled way edge are delineated by curbs or other 
markings. Edge line markings may be used where edge delineation is 
desirable to minimize unnecessary driving on paved shoulders or on 
refuge areas that have lesser structural pavement strength than the 
adjacent roadway.

3B.4  Extensions Through Intersections or Interchanges

Standard:
    Pavement markings extended into or continued through an 
intersection or interchange area shall be the same color and at least 
the same width as the line markings they extend.
Guidance:
    Where highway design or reduced visibility conditions make it 
desirable to provide control or to guide vehicles through an 
intersection or interchange such as at offset, skewed, complex multi-
legged intersections, or where multiple turn lanes are used, dotted 
line markings should be used to extend longitudinal line markings as 
necessary through an intersection or interchange area (Figures 3-9, 3-
9a, 3-11 & 3-20).
    Where greater restriction is required, solid lane lines or 
channelizing lines should be extended into or continued through 
intersections.

BILLING CODE 4910-22-M

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3B.9  Stop and Yield Lines

Standard:
    Stop lines are solid white lines extending across approach lanes to 
indicate the point at which the stop is intended or required to be 
made.
    Yield lines consist of a row of isosceles triangles extending 
across approach lanes, and pointing toward approaching vehicles to 
indicate the point at which the yield is intended or required to be 
made.
Guidance:
    Stop lines should be 300 to 600 mm (12 to 24 in) wide.
    Stop lines should be used to indicate the point behind which 
vehicles are required to stop, in compliance with a STOP sign or 
traffic signal.
    The individual triangles comprising the yield line should have a 
base of 0.3 to 0.6 m (12 to 24 in) wide and a height equal to 11/2 
times the base. The space between the triangles should be 75 to 300 mm 
(3 to 12 in). (See Figure 3-24)
    Option: Yield lines may be used to indicate the point behind which 
vehicles are required to yield in compliance with a YIELD sign.
Guidance:
    Stop and yield lines, where used, should be placed 1.2 m (4 ft) in 
advance of and parallel to the nearest crosswalk line, except at 
roundabouts as provided for in Section 3B.17.
    In the absence of a marked crosswalk, the stop line or yield line 
should be placed at the desired stopping or yielding point, but should 
be placed no more than 9.0 m (30 ft) nor less than 1.2 m (4 ft) from 
the nearest edge of the intersecting traveled way. Stop lines should be 
placed to ensure sufficient sight distance for all approaches to an 
intersection.
    Stop lines at mid-block signalized locations should be placed at 
least 12.0 m (40 ft) in advance of the nearest signal indication. (See 
Section 4B.15)

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3B.12  Pavement Word and Symbol Markings

Support:
    Word and symbol markings on the pavement are used for the purpose 
of guiding, warning, or regulating traffic. Symbol messages are 
preferable to word messages. Examples of standard symbol, word, and 
arrow pavement markings are shown in Figures 3-18 and 3-19.
Standard:
    Word and symbol markings should be white.
Guidance:
    Large letters and numerals should be 1.8 m (6 ft) or more in 
height.
    Word and symbol markings should not exceed three lines of 
information.
    If a pavement marking word message consists of more than one word, 
it should read in the direction of travel. The first word should be 
nearest to the road user.
    The longitudinal space between words or symbol message markings, 
including arrow markings, should be at least four times the height of 
the characters for low speed roads but not more than ten times the 
height of the characters under any conditions.
    The number of different word and symbol markings used should be 
minimized to provide effective guidance and avoid misunderstanding.
    Pavement word and symbol markings should be no more than one lane 
in width except ``SCHOOL'' word markings.
    Option: The ``SCHOOL'' word markings may extend to the width of two 
lanes. (Section 7C.6).
Guidance:
    When the ``SCHOOL'' word markings are extended to the width of two 
lanes, the characters should be 3 m (10 ft) or more in height. (Section 
7C.6).
    Option: The International Symbol of Access (ISA) parking space 
markings may be placed in each parking space designated for use by 
persons with disabilities. A blue background with a white border may 
supplement the wheelchair symbol as shown in Figure 3-17.
Standard:
    Where a through lane becomes a mandatory turn lane, lane-use arrow 
markings shown in Figure 3-19 shall be used and accompanied by standard 
signs.
    The standard designs of lane use, lane reduction, and wrong way 
arrow markings are shown and discussed in Figure 3-19.
Guidance:
    Where a through lane becomes a mandatory turn lane, signs or 
markings should be repeated as necessary to prevent entrapment and to 
help the road user select the appropriate lane in advance of reaching a 
queue of waiting vehicles.
    Option: Lane-use arrow markings in Figure 3-19 may be used to 
convey either guidance or mandatory messages.
    The message marking ``ONLY'' may be used to supplement lane-use 
arrow markings (Figures 3-18 and 3-20).
    In situations where a lane reduction transition occurs, the lane 
reduction arrow markings in Figure 3-19 may be used.
    The wrong-way arrow markings in Figure 3-19 may be placed near the 
downstream terminus of a ramp as shown in Figures 3-12(a) and 3-21(b). 
This arrow indicates the correct direction of traffic flow to warn of 
travel in the wrong direction.
    A yield-ahead triangle symbol or ``YIELD AHEAD'' word pavement 
markings may only be used in advance of intersections where approaching 
traffic will encounter a YIELD sign. (See Figure 3-25).
Support:
    Lane-use arrow markings are often used to provide guidance in turn 
bays (Figure 3-20) where turns may or may not be mandatory and in two-
way left-turn lanes (Figure 3-3(a)).
    Where crossroad channelization or ramp geometry do not make wrong-
way movements physically difficult, guidance to a potential wrong-way 
road user can be provided by placing a lane-use arrow marking in each 
lane of the ramp near the crossroad where it is clearly visible.
    Option: word and symbol markings may include, but are not limited 
to, the following: Other words or symbols may also be used under 
certain conditions.
    a. Regulatory
STOP
RIGHT (LEFT) TURN ONLY
40 KM/H (25 MPH)
Arrow Symbols
    b. Warning
STOP AHEAD
YIELD AHEAD
YIELD AHEAD Triangle Symbol
SCHOOL X-ING
SINGAL AHEAD
PED X-ING
SCHOOL
R X R
    c. Guide
US 40
STATE 135
ROUTE 40
Standard:
    The word ``STOP'' shall not be used on the pavement unless 
accompanied by a stop line (Section 3B.9) and STOP sign (Section 2B.4).
    The word ``STOP'' shall not be placed on the pavement in advance of 
a stop line, unless every vehicle is required to stop at all times.
    The yield-ahead triangle symbol or ``YIELD AHEAD'' word pavement 
marking shall not be used unless a YIELD sign (Section 2B.7) is in 
place at the intersection. The yield-ahead symbol marking shall be as 
shown in Figure 3-25.

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3B.13  Preferential Lane Word and Symbol Markings

Standard:
    When a lane is assigned full or part time to a particular class or 
classes of vehicles, preferential lane markings shall be used.
    Signs or signals shall be used with preferential lane word or 
symbol markings
    All preferential lane word and symbol markings shall be white.
    all preferential lane word and symbol markings shall be positioned 
laterally in the center of the preferred-use lane.
Support:
    Preferential lanes may be designated to identify a wide variety of 
special uses. This could include, but is not limited to HOV (High 
Occupancy Vehicle) lanes, bicycle lanes, bus only lanes, taxicab only 
lanes, etc.
Standard:
    Where a preferential lane use is established, the preferential lane 
shall be marked with one of the following symbol or word markings for 
the preferential lane use specified;
     HOV lane, the preferential lane use marking for HOV lanes 
shall consist of white lines formed in a diamond shape. The diamond 
shall be at least 750 mm (2.5 ft) wide and 3.6m (12 ft) in length. The 
lines shall be at least 150 mm (6 in) in width.
     Bicycle lane; the preferential lane use marking for a 
bicycle lane shall consist of a bicycle symbol or the word marking 
``BIKE LANE.'' (See Section 9C, Markings, and Figures 9-4 through 9-9).
     Bus Only Lane; the preferential lane use markings for a 
busses only lane shall consist of the word markings ``BUS ONLY'' (See 
Section 3B.12).
     Taxi Only Lane; the preferential lane use marking for a 
taxi only lane shall consist of the word markings ``TAXI ONLY'' (See 
Section 3B.12).
     Other preferential lane use marking shall be identified in 
accordance with Section 3B.12.
Guidance:
    Engineering judgement should determine the need for supplemental 
devices such as tubular markers, traffic cones, or flashing lights.
SUPPORT:
    The spacing of the marking is an engineering judgement based on 
prevailing speed, block lengths, distance form intersections and other 
factors that affect clear communication to the road user. Markings 
spaced as close as 24 m (80 ft) apart might be appropriate on city 
streets, while markings spaced 300 m (1,000 ft) may be appropriate for 
freeways.
    The vehicle occupancy requirements established for an HOV lane may 
be included in sequence after the diamond symbol. The word message 
``HOV'' may be used in lieu of the diamond symbol.

3B.15  Curb Markings

Support:
    Curb markings are most often used to indicate parking regulations 
or to delineate the curb.
Standard:
    Signs shall be used with curb markings those areas where curb 
markings are frequently obliterated by snow and ice accumulation.
    Where curbs are marked, the colors shall conform to the general 
principles of markings (Section 3A.5).
Guidance:
    When curb markings are used without signs to convey parking 
regulations, a legible word marking regarding the regulation should be 
placed on the curb. For example, ``No Parking,'' or ``No Standing.''
    Retroreflective solid yellow marking should be placed on paved 
median noses and the curbs of islands that are located in the line of 
traffic flow where the paved median nose or the curb serves to channel 
traffic to the right of the obstruction.
    Retroreflective solid white marking should be used when traffic may 
pass on either side of the island.
    Option: Local authorities may prescribe special colors for curb 
markings to supplement standard signs for parking regulation.
Support:
    It is usually advisable to establish parking regulations by 
installing standard signs (Sections 2B.31, 2B.32 and 2B.33) because 
certain curb markings such as white and yellow curb markings are often 
used only for curb delineation and visibility purposes.
    Where the curbs of the islands become parallel to the direction of 
traffic flow it is not necessary to mark the curbs unless an 
engineering study indicates the need for this type of delineation.
    Curbs at openings in a continuous median island need not be marked 
unless an engineering study indicates the need for this type of 
marking.

3B.16  Preferential Lane Longitudinal Markings for Motorized Vehicles

Standard:
    Preferential lane longitudinal markings for motorized vehicles 
shall be marked with the appropriate word or symbol pavement markings 
in accordance with Section 3B.13.
Support:
    Preferential lanes can take many forms depending on the level of 
usage and the design of the facility. They may be physically separated 
from the other travel lanes by a barrier, median, or painted neutral 
area, or they may be concurrent with other travel lanes and be 
separated only by longitudinal pavement markings. Further, physically 
separated preferential lanes may operate in the same direction or be 
reversible.
    Preferential lane may be operated either full-time (24 hours per 
day on all days), for extended periods of the day, or part-time 
(restricted usage during specific hours on specified days).
Standard:
    The following four sections are presented in tabular form in Table 
3-2:
    2. Physically separated, non-reversible preferential lane; 
longitudinal pavement markings for preferential lane physically 
separated from the other travel lanes by a barrier, median, or painted 
neutral area shall consist of a single normal solid yellow line at the 
left edge of the travel lane(s), a single normal solid white line at 
the right edge of the travel lane(s), and if there are two or more 
preferential lanes, the travel lanes shall be separated with a normal 
broken white line. (See Figure 3.23a).
    3. Physically separated, reversible preferential lane; longitudinal 
pavement markings for preferential lane shall consist of a single 
normal solid white line at both edges of the travel lane(s), and if 
there are two or more preferential lanes, the travel lanes shall be 
separated with a normal broken white line. (See Figure 3.23(a)).
    4. Concurrent flow (left side) preferential lane; longitudinal 
pavement markings for a full-time or part-time preferential lane on the 
left side of the other traveled lanes, shall consist of a single normal 
solid yellow line at the left edge of the preferential travel lane(s) 
and one of the following at the right edge of the preferential travel 
lane(s):
    a. a double solid wide white line where crossing is prohibited; see 
Figure 3-23(b);
    b. a single solid wide white line where crossing is discouraged; 
see Figure 3-23(c);

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    c. a single broken wide white line where crossing is permitted; see 
Figure 3-23(d).
    If there are two or more preferential lanes, the travel lanes shall 
be separated with a normal broken white line.
    4. Concurrent flow (right side) preferential lane; longitudinal 
pavement markings for a full-time or part-time preferential lane on the 
right of the other travel lanes, shall consist of a single normal solid 
white line at the right edge of the preferential travel lane(s) if 
warranted and one of the following at the left edge of the preferential 
travel lane(s):
    a. a double solid wide white line where crossing is prohibited; see 
Figure 3-23(b);
    b. a single solid wide white line where crossing is discouraged; 
see Figure 3-23(c);
    c. a single broken wide white line were crossing is permitted, see 
Figure 3-23(d);
    d. a single dotted normal white line where crossing is permitted by 
any vehicle to perform a right turn maneuver; see Figure 3-23(e).
    If there are two or more preferential lanes, the travel lanes shall 
be separated with a normal broken white line.
Guidance:
    When concurrent flow preferential lanes and other travel lanes are 
separated by more than 1.2 m (4 ft) chevron markings should be placed 
in the neutral area. The chevron spacing should be 30 m (100 ft) or 
greater.
    For full time or part-time concurrent flow preferential lanes, the 
spacing or skip pattern of the single broken wide white line may be 
reduced. The width of the single broken wide white line may also be 
increased.

                                                            Table 3-2. Standard Lane Markings
--------------------------------------------------------------------------------------------------------------------------------------------------------
               Types of preferential lane                                                     Longitudinal lane lines
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                     Left edge line                      Right edge line             2+ Lane  centerline
--------------------------------------------------------------------------------------------------------------------------------------------------------
Physically separated..............  Non-reversible......  Single normal solid yellow line....  Single normal solid white line.....  Travel lanes shall
                                                                                                                                     be separated with a
                                                                                                                                     normal broken white
                                                                                                                                     line
                                    Reversible..........  Single normal solid white line at    Single normal solid white line at
                                                           both edges.                          both edges.
Concurrent flow...................  Left Side...........  Single normal solid yellow line at   A double solid wide white line
                                                           left edge.                           where crossing is prohibited; (See
                                                                                                Figure 3-23b)..
                                                          ...................................  A single solid wide white line
                                                                                                where crossing is discouraged;
                                                                                                (See Figure 2-23c)..
                                                          ...................................  A single broken wide white line
                                                                                                where crossing is permitted; (See
                                                                                                Figure 3-23e)..
                                    Right Side..........  A double solid wide white line       Single normal solid white line at
                                                           where crossing is prohibited; (See   the right edge.
                                                           figure 3-23e)..
                                                          A single solid wide white line
                                                           where crossing is discouraged;
                                                           (See Figure 3-23e..
                                                          A single broken wide white line
                                                           where crossing is permitted; (See
                                                           Figure 3-23e)..
                                                          A single dotted normal white line
                                                           where crossing is permitted for
                                                           any vehicle to perform a right
                                                           turn maneuver (See figure 3-23e)..
--------------------------------------------------------------------------------------------------------------------------------------------------------
The standard lane markings listed in this table is provided in a tabular format for reference. This information is also described in the second standard
  in Section 3B.16.


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3B.17  Markings for Roundabouts

Support:
    Roundabouts are distinctive circular roadways with the following 
three critical characteristics:
    1. a requirement to yield at entry which gives a vehicle on the 
circular roadway the right-of-way; and
    2. a deflection of the approaching vehicle around the central 
island; and
    3. a flare or widening of the approach to match the width of the 
circular roadway.
    Typical markings for roundabouts are shown in Figure 3-26 and 3-
26a.
    Option: A yellow edge line may be placed around the inner (left) 
edge of the circular roadway.
Guidance:
    A white line should be used on the outer (right) side of the 
circular roadway as follows: a solid line along the splitter island and 
a dotted line across the lane(s) entering the roundabout.
    Edge line extensions should not be placed across the exits from the 
circular roadway.
    Where crosswalk markings are used, these markings should be located 
a minimum of 8m (25 ft) upstream for the yield line, or, if none, from 
the dotted white line.
    Option: Lane lines may be used on the circular roadway when there 
is more than one lane.

3B.18  Markings for Other Circular Intersections

Support:
    Other circular intersections include but are not limited to 
rotaries, traffic circles, and residential traffic calming designs.
    Option: The markings shown in Figures 3-26 and 3-26a may be used in 
other circular intersections when engineering judgement indicates that 
their presence will benefit drivers and/or pedestrians.

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3B.19  Speed Hump Markings

Standard:
    Speed hump markings are a special white marking placed on a speed 
hump to identify its location.
    Option: Speed humps, except those used for crosswalks, may be 
marked in accordance with Figure 3-27. The markings shown in Figure 3-
28 may be used where the speed hump also functions with a crosswalk, or 
speed table.
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3B.20  Advance Speed Hump Marking

Standard:
    Advance speed hump markings are a special white marking placed in 
advance of speed humps or other engineered, vertical roadway 
deflections such as dips.
    Option: Advance speed hump markings may be used in advance of an 
engineered, vertical roadway deflection where added visibility is 
desired or where such deflection is not expected. (Figure 3-29)
    Advance pavement wording such as ``BUMP'' or ``HUMP'' (see section 
3B.12) may be used on the approach to a speed hump either alone or in 
conjunction with advance speed hump markings.
Guidance:
    If used, advance speed hump markings should be installed in each 
approach lane.

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BILLING CODE 4910-22-C

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4B.2  Basis of Installation or Removal of Traffic Control Signals

Guidance:
    The selection and use of highway traffic signals should be based on 
an engineering study of roadway, pedestrian, bicycle, and traffic 
conditions.
    If changes in traffic patterns eliminate the need for a highway 
traffic signal, consideration should be given to removing it and 
replacing it with appropriate alternative traffic control devices.
    Option: If the engineering study indicates that the traffic control 
signal is no longer justified, removal may be completed using the 
following steps:
    a. Determine the appropriate traffic control to be used after 
removal of the signal.
    b. Remove any sight-distance restrictions as necessary.
    c. Inform the public of the removal study, for example by 
installing an information sign (or signs) with the legend TRAFFIC 
SIGNAL UNDER STUDY FOR REMOVAL at the signalized location in a position 
where it is visible to all road users.
    d. Flash or cover the signal heads for a minimum of 90 days, and 
install the appropriate stop control or other traffic control devices.
    e. Remove the signal if the engineering data collected during the 
removal study period confirms that the signal is no longer needed. 
Instead of total removal of the traffic control signal, the poles and 
cables may remain in place for a maximum of one year after removal of 
the signal heads for continued analysis.
Support:
    A careful analysis of traffic operations, pedestrian needs, and 
other factors at a large number of signalized and unsignalized 
intersections, coupled with the judgment of experienced engineers, has 
provided a series of warrants, described in Section 4C, that define the 
minimum conditions under which installing highway traffic signals may 
be justified.

4C.1  Studies and Factors for Justifying Traffic Control Signals

Standard:
    A traffic engineering study of traffic conditions, pedestrian 
characteristics, and physical characteristics of the location shall be 
performed to determine whether installation of a traffic control signal 
is justified at a particular location.
    The investigation of the need for a traffic control signal shall 
include an analysis of the applicable factors contained in the 
following traffic signal warrants and other factors related to existing 
operation and safety at the study location:
Warrant 1--Eight-hour vehicular volume.
Warrant 2--Four-hour vehicular volume.
Warrant 3--Peak hour.
Warrant 4--Pedestrian volume.
Warrant 5--School crossing.
Warrant 6--Coordinated signal system.
Warrant 7--Accident experience.
Warrant 8--Roadway network.
    The satisfaction of a traffic signal warrant or warrants shall not 
in itself require the installation of a traffic control signal.
Guidance:
    A traffic control signal should not be installed unless one or more 
of the factors described in this section are met.
    A traffic control signal should not be installed unless an 
engineering study indicates that installing a traffic control signal 
will improve the overall safety and/or operation of the intersection.
    A traffic control signal should not be installed if it will 
seriously disrupt progressive traffic flow.
    The study should consider the effects of the right-turn vehicles 
from the minor-roadway approaches. Engineering judgment should be used 
to determine what, if any, portion of the right-turn traffic is 
subtracted from the minor-roadway traffic count when evaluating the 
count against the above warrants.
    Engineering judgment should also be used in applying various 
traffic signal warrants to cases where approaches consist of one lane 
plus one left-turn or right-turn lane. The site-specific traffic 
characteristics dictate whether an approach should be considered one 
lane or two lanes. For example, for a roadway approach with one lane 
(for through and right-turning traffic) plus a left-turn lane, 
engineering judgment could indicate that it should be considered a one-
lane approach if the traffic using the left-turn lane is minor. In such 
a case, the total traffic volume approaching the intersection should be 
applied against the warrants as a one-lane approach. The approach 
should be considered two lane if traffic splits in half and the left-
turn lane is sufficient length to accommodate all left-turn vehicles.
    Similar judgment and rationale should be applied to a roadway 
approach with one lane plus a right-turn lane. In this case, the degree 
of conflict of minor-roadway right-turn traffic with traffic on the 
major roadway should be considered. Thus, right-turn traffic should not 
be included in the minor-roadway volume if the movement enters the 
major roadway with minimal conflict. The approach should be evaluated 
as a one-lane approach, and only the traffic volume in the through/
left-turn lane considered.
    At a location that is under development or construction and where 
it is not possible to obtain a traffic count that would represent 
future traffic conditions, vehicular and pedestrian hourly volumes 
should be estimated as part of an engineering study for comparison with 
traffic signal warrants.
    For warrant analysis, a location with a wide-median should be 
considered as one intersection.
    Option: Engineering study data may include the following:
    a. The number of vehicles entering the intersection in each hour 
from each approach during 12 consecutive hours of an average day. The 
12 hours selected should contain the greatest percentage of the 24-hour 
traffic volume.
    b. Vehicular volumes for each traffic movement from each approach, 
classified by vehicle type (heavy trucks, passenger cars and light 
trucks, public-transit vehicles, and, in some locations, bicycles), 
during each 15-minute period of the two hours in the morning and two 
hours in the afternoon during which total traffic entering the 
intersection is greatest.
    c. Pedestrian volume counts on each crosswalk during the same 
periods as the vehicular counts in paragraph b above and during hours 
of highest pedestrian volume. Where people who are young, elderly, 
physically challenged, have visual disabilities, or need special 
consideration, the pedestrians and their crossing times may be 
classified by general observation.
    d. Information about nearby facilities and activity centers that 
serve the elderly, people with disabilities, and/or requests from 
people with disabilities for accessible crossing improvements along 
this route. These people may not be adequately reflected in the 
pedestrian volume count if the lack of a signal restrains their 
mobility.
    e. The posted or statutory speed limit or the 85th-percentile speed 
on the uncontrolled approaches to the location.
    f. A condition diagram showing details of the physical layout, 
including such features as inter-sectional geometrics, channelization, 
grades, sight-distance restrictions, bus stops and routings, parking 
conditions, pavement markings, roadway lighting, driveways, nearby 
railroad crossings, distance to nearest highway traffic signals, 
utility

[[Page 73657]]

poles and fixtures, and adjacent land use.
    g. A collision diagram showing accident experience by type, 
location, direction of movement, severity, time of day, date and day of 
week for at least one year.
    The following data, which are desirable for a more precise 
understanding of the operation of the intersection, may be obtained 
during the periods specified in paragraph b above:
    a. Vehicle-seconds delay determined separately for each approach.
    b. The number and distribution of gaps in vehicular traffic on the 
major roadway when minor-roadway traffic finds it difficult to use the 
intersection safely.
    c. The posted or statutory speed limit or the 85th-percentile speed 
on controlled approaches at a point near to the intersection but 
unaffected by the control.
    d. Pedestrian delay time for at least two 30-minute peak pedestrian 
delay periods of an average weekday or like periods of a Saturday or 
Sunday.

4D.3  Provisions for Pedestrians

Support:
    Chapter 4E contains additional information regarding pedestrian 
signals.
Standard:
    The design and operation of traffic control signals shall take into 
consideration the needs of pedestrians, including those with 
disabilities, as well as vehicular traffic.
    If engineering judgment indicates the need for pedestrian 
provisions for a given pedestrians or other non-motorist movement, 
signal faces conveniently visible to pedestrians shall be provided by 
pedestrian signal heads or a signal face for an adjacent vehicular 
movement.
Guidance:
    Safety considerations should include the installation, where 
appropriate, of accessible pedestrian signals that provide information 
in non-visual format (including audible tones, verbal messages, and/or 
vibrotactile information). Provisions for accessible signals are 
presented in Sections 4E.6 and 4E.8.
    Where pedestrian movements regularly occur but are low in volume, 
pedestrians should be provided with sufficient time to cross the 
roadway by adjusting the traffic control signal operation and timing to 
continually provide sufficient crossing time or by providing pedestrian 
detectors.
    Option: If it is desirable to prohibit certain pedestrian movements 
at a traffic control signal, a NO PEDESTRIAN CROSSING sign (R9-3a, R9-
3) may be used. (see Section 2B.36.)

4D.4  Meaning of Vehicle Signal Indications

Support:
    The Uniform Vehicle Code is the primary source for the standards 
for the meaning of vehicle signal indications to both vehicle operators 
and pedestrians set forth below, and the standards for the meaning of 
separate pedestrian signal indications as set forth in Section 4D.2.
Standard:
    Unless otherwise determined by law, the following meanings shall be 
given to highway traffic control signal indications for vehicles and 
pedestrians:
    a. Steady green indications shall have the following meanings:
    (1) Traffic, except pedestrians, facing a CIRCULAR GREEN indication 
may proceed straight through or turn right or left except as such 
movement is modified by lane-use signs, turn prohibition signs, lane 
markings, or roadway design. But vehicular traffic, including vehicles 
turning right or left, shall yield the right-of-way to other vehicles, 
and to pedestrians lawfully within the intersection or an adjacent 
crosswork, at the time such signal indication is exhibited.
    (2) Traffic, except pedestrians, facing a GREEN ARROW indications, 
shown alone or in combination with another indication, may cautiously 
enter the intersection only to make the movement indicated by such 
arrow or such other movement as is permitted by other indications shown 
at the same time. Such vehicular traffic shall yield the right-of-way 
to pedestrians lawfully within an adjacent crosswalk and to other 
traffic lawfully using the intersection.
    (3) Unless otherwise directed by a pedestrian signal head, 
pedestrians facing any green indication, except when the sole green 
indication is a turn arrow, may proceed across the roadway within any 
marked or unmarked crosswalk.
    b. Steady yellow indications shall have the following meanings:
    (1) Traffic, except pedestrians, facing a steady CIRCULAR YELLOW or 
YELLOW ARROW indication is thereby warned that the related green 
movement is being terminated or that a red indication will be exhibited 
immediately thereafter, when vehicular traffic shall not enter the 
intersection.
    (2) Pedestrians facing a steady CIRCULAR YELLOW or YELLOW ARROW 
indication, unless otherwise directed by a pedestrian signal head, are 
thereby advised that there is insufficient time to cross the roadway 
before a red indication is shown, and no pedestrian shall then start to 
cross the roadway.
    c. Steady red indications shall have the following meanings:
    (1) Vehicular traffic facing a steady CIRCULAR RED indication alone 
shall stop at a clearly marked Stop line, but if there is no stop line, 
traffic shall stop before entering the crosswalk on the near side of 
the intersection, or if there is no crosswalk, then before entering the 
intersection, and shall remain standing until an indication to proceed 
is shown, or as provided below.
    Except when a sign is in place prohibiting a turn on red, vehicular 
traffic facing a CIRCULAR RED indication may enter the intersection to 
turn right, or to turn left from a one-way roadway into a one-way 
roadway, after stopping. Such vehicular traffic shall yield the right-
of-way to pedestrians lawfully within an adjacent crosswalk and to 
other traffic lawfully using the intersection.
    (2) Unless otherwise directed by a pedestrian signal head, 
pedestrians facing a steady CIRCULAR RED indication alone shall not 
enter the roadway.
    d. Flashing signal indications shall have the following meanings:
    (1) Flashing yellow--When a yellow lens is illuminated with rapid 
intermittent flashes, drivers of vehicles may proceed through the 
intersection or past such indication only with caution.
    (2) Flashing red--When a red lens is illuminated with rapid 
intermittent flashes, drivers of vehicles shall stop at a clearly 
marked stop line, but if there is no stop line, they shall stop, before 
entering the crosswalk on the near side of the intersection, or if 
there is no crosswalk, at the point nearest the intersecting roadway 
where the driver has a view of approaching traffic on the intersecting 
roadway before entering the intersection. The right to proceed shall be 
subject to the rules applicable after making a stop at a STOP sign.
    (3) Flashing YELLOW ARROW indications have the same meaning as the 
corresponding flashing circular indication, except that they apply only 
to drivers of vehicles intending to make the movement indicated by the 
arrow.

4D.5  Application of Steady Signal Indications

Standard:
    When a traffic signal installation is being operated in a steady 
(stop-and-go)

[[Page 73658]]

mode, at least one lens in each signal face shall be illuminated at any 
given time.
    A signal face(s) that controls a particular vehicular movement 
during any interval of a cycle shall control that same movement during 
all intervals of the cycle.
    Steady signal indications shall be applied as follows:
    a. A steady CIRCULAR RED indication
    (1) Shall be displayed when it is intended to prohibit traffic, 
except pedestrians directed by a pedestrian signal head, from entering 
the intersection or other controlled area. Turning after stopping is 
permitted as stated in Section 4D.4(c)(1).
    (2) Shall be displayed with the appropriate GREEN ARROW indications 
when it is intended to permit traffic to make a specified turn and to 
prohibit traffic from proceeding straight ahead through the 
intersection or other controlled area, except in exclusive mode turn 
signal faces.
    b. A steady CIRCULAR YELLOW indication
    (1) Shall be displayed following a CIRCULAR GREEN indication in the 
same signal face.
    (2) Shall not be displayed in conjunction with the change from the 
CIRCULAR RED indication to the CIRCULAR GREEN indication.
    (3) Shall be followed by the display of a CIRCULAR RED indication 
except that, when entering preemption operation, the display of the 
previous CIRCULAR GREEN indication shall be permitted following a 
CIRCULAR YELLOW indication. (See Section 4D.13.)
    c. A steady CIRCULAR GREEN indication shall be displayed only when 
it is intended to permit traffic to proceed in any direction that is 
lawful and practical.
    d. A steady YELLOW ARROW indication
    (1) Shall be displayed in the same direction as a GREEN ARROW 
indication following a GREEN ARROW indication in the same signal face, 
unless the GREEN ARROW indication and a CIRCULAR GREEN indication 
terminate simultaneously in the same signal face.
    (2) Shall not be displayed when any conflicting vehicular movement 
has a green or yellow indication or any conflicting pedestrian movement 
has a WALK or flashing DONT WALK indication. (See Section 4D.9.)
    (3) Shall be terminated by a CIRCULAR YELLOW indication or a 
CIRCULAR RED indication except
    (a) When entering preemption operation, the display of the previous 
GREEN ARROW indication shall be permitted following a YELLOW ARROW 
indication.
    (b) When the movement controlled by the arrow is to continue as 
permitted during a subsequent CIRCULAR GREEN indication.
    e. A steady GREEN ARROW indication
    (1) Shall be displayed only to allow vehicular movements, in the 
direction indicated, that are not in conflict with other vehicles 
moving on a green or yellow indication or with pedestrians crossing in 
conformance with a WALK or flashing DONT WALK indication. (see Section 
4D.9.)
    (2) Shall be displayed on a signal face that controls a left-turn 
movement when said movement is not in conflict with other vehicles 
moving on a green or yellow indication or with pedestrians crossing in 
conformance with a WALK or flashing DONT WALK indication. (See Section 
4D.9.)
    (3) Shall not be required on the stem of T intersections or for 
turns from one-way roadways.
    Option: Steady YELLOW ARROW, and GREEN ARROW indications, if not 
otherwise prohibited, may be used in lieu of the corresponding circular 
indications at the following locations:
    a. On an approach intersecting a one-way roadway.
    b. Where certain movements are prohibited.
    c. Where certain movements are physically impossible.

4D.6  Application of Steady Signal Indications For Left Turns

Support:
    Left-turning traffic is controlled by one of four modes as follows:
    a. Permissive Mode--turns made on the CIRCULAR GREEN indication 
after yielding to oncoming traffic and pedestrians.
    b. Protected Mode--turns made only when the left-turn GREEN ARROW 
indication is displayed.
    c. Protected/Permissive Mode--both modes occur on an approach 
during the same cycle.
    d. Variable left-turn mode--the operating mode changes among the 
protected mode and/or the protected/permissive mode and/or the 
permissive mode.
Standard:
    A leading protected-only left turn phase is one in which the GREEN 
ARROW, YELLOW ARROW, and CIRCULAR RED is given to vehicles turning left 
from a particular street before the CIRCULAR GREEN indication is given 
to the through movement on the same street.
    Option:
    A leading protected-only left turn phase may be considered if there 
are not a sufficient number of acceptable gaps for the left-turning 
movement.
Standard:
    The required left-turn signal indication or indications shall be 
determined by the selected mode of left-turn operation, as follows:
    a. Permissive Mode only--The signal indication for permissive mode 
left turns shall be identical to the signal indication for through 
traffic. A separate signal indication or signal face for left turns 
shall not be required.
    b. Protected Mode only--At least one left-turn signal face shall be 
provided in addition to the two approach signal faces required in 
Section 4D.15 for the through movement. The left-turn signal face shall 
be capable of displaying one of the following sets of indications:
    (1) GREEN and YELLOW left-turn ARROW indications and a CIRCULAR RED 
indication. Only one of the three lenses shall be illuminated at any 
given time. If the CIRCULAR RED indication would be readily visible to 
other traffic on the same approach, either a LEFT TURN SIGNAL sign 
(R10-10) or a visibility-limited CIRCULAR RED signal indication shall 
be used.
    (2) CIRCULAR RED, CIRCULAR YELLOW, CIRCULAR GREEN, and left-turn 
GREEN ARROW indications. This four-section signal face shall be used 
only when the CIRCULAR GREEN and left-turn GREEN ARROW indications 
begin and terminate together. During each interval, the circular 
indications shall be the same as the indication on the signal face(s) 
for the adjacent through traffic.
    c. Protected/Permissive Mode--A separate signal face is not 
required for the left turn, but, if provided, it shall be considered an 
approach signal face, and shall meet the following requirements:
    (1) During the protected left-turn movement, the signal face shall 
simultaneously display:
    a) a left-turn GREEN ARROW; and
    b) a circular indication that is the same as the indication for the 
adjacent through lane on the same approach as the protected left-turn.
    During the protected left-turn movement, the signal face for 
through traffic on the opposing approach shall simultaneously display a 
CIRCULAR RED indication.
    (2) During the permissive left-turn movement, all signal faces on 
the

[[Page 73659]]

approach shall display the CIRCULAR GREEN indication.
    (3) All signal faces on the approach shall simultaneously display 
the same color of circular indications to both through and left-turn 
road users.
    (4) A supplementary sign shall not be required. If used, it shall 
be a LEFT TURN YIELD ON GREEN (symbolic green ball) sign (R10-12).
    d. Variable left-turn mode--If the protected mode occurs during one 
or more periods of the day, and the permissive mode or the combined 
protected/permissive mode occurs during other periods of the day, the 
requirements of paragraphs a, b, and c above that are appropriate to 
that mode of operation shall be met subject to the following:
    (1) Signal faces for the protected mode shall not be limited to 
three signal sections,
    (2) The display of the CIRCULAR GREEN and CIRCULAR YELLOW 
indications shall not be required when operating in the protected mode.
    (3) The left-turn GREEN ARROW and left-turn YELLOW ARROW 
indications shall not be displayed when operating in the permissive 
mode.
    (4) A supplementary sign shall not be required. If used, both the 
LEFT TURN SIGNAL sign (R10-10) and the LEFT TURN YIELD ON GREEN 
(symbolic green ball) sign (R10-12) shall be provided.

4D.7  Application of Steady Signal Indications For Right Turns

Support:
    Right-turning traffic is controlled by one or four modes as 
follows:
    a. Permissive Mode--turns made on the CIRCULAR GREEN indication 
after yielding to pedestrians.
    b. Protected mode--turns made only when the right-turn GREEN ARROW 
indication is displayed.
    c. Protected Permissive Mode--both modes occur on an approach 
during the same cycle.
    d. Variable Right-Turn Mode--the operating mode changes among the 
protected mode, the protected/permissive mode, and/or the permissive 
mode during different periods of the day.
Standard:
    The required right-turn signal faces and operation shall be 
determined by the selected mode of right-turn operation, as follows:
    a. Permissive Mode only--A separate signal indication or signal 
face for right turns shall not be required. The signal indication for 
permissive mode right turns shall be identical to the indication for 
adjacent through traffic, except that if the right turn is held to 
provide an exclusive pedestrian movement, a separate right-turn RED 
CIRCULAR indication shall be provided along with a RIGHT TURN SIGNAL 
sign, R10-10.
    b. Protected Mode only--At least one right-turn signal face shall 
be provided in addition to the two approach signal faces required for 
the through movement in Section 4C-15. The right-turn signal face shall 
be capable of displaying one of the following sets of indications:
    (1) GREEN and YELLOW right-turn ARROW indications and a CIRCULAR 
RED indication. Only one of three lenses shall be illuminated at any 
given time. If the CIRCULAR RED indication would be readily visible to 
other traffic movements on the same approach, either a RIGHT TURN 
SINGLE sign (R10-120) or a visibility-limited CIRCULAR RED signal 
indication shall be used; or
    (2) CIRCULAR RED, CIRCULAR YELLOW, CIRCULAR GREEN, and right-turn 
GREEN ARROW indications. This four-section signal shall be used only 
when the CIRCULAR GREEN and left-turn GREEN ARROW indications begin and 
terminate together. During each interval, the circular indication shall 
be the same as the indication on the signal faces for adjacent through 
traffic.
    c. Protected/Permissive Mode--A separate signal face is not 
required for the right turn, but, if provided, it shall be considered 
an approach signal face, and shall meet the following requirements.
    (1) During the protected right-turn movement, the single face shall 
simultaneously display:
    (a) a right-turn GREEN ARROW indication and
    (b) a circular indication that is identical to the adjacent through 
lane indication on the same approach with the protected right turn.
    (2) During the permissive right-turn movement, all signal faces on 
the approach shall display the CIRCULAR GREEN indication.
    (3) All signal faces on the approach shall simultaneously display 
the same color of circular indications to both through and right-turn 
road users.
    d. Variable right-turn mode--If the protected mode occurs during 
one or more periods of the day, and the permissive mode or the combined 
protected/permissive mode occurs during other periods of the day, the 
requirements of paragraphs a, b, and c above that are appropriate to 
that mode of operation shall be met subject to the following:
    (1) Signal faces for the protected mode shall not be limited to 
three signal sections.
    (2) The display of the CIRCULAR GREEN and CIRCULAR YELLOW 
indications shall not be required when operating in the exclusive mode.
    (3) The right-turn GREEN ARROW and right-turn YELLOW ARROW 
indications shall not be displayed when operating in the permissive 
mode.
    Additional appropriate signal indications or changeable message 
signs shall be used, if necessary, to meet these requirements.

4D.8  Prohibited Steady Signal Indications

Standard:
    The following combinations of signal indications shall not be 
simultaneously displayed on any one signal face:
    a. CIRCULAR GREEN with CIRCULAR YELLOW.
    b. CIRCULAR RED with CIRCULAR YELLOW.
    c. CIRCULAR GREEN with CIRCULAR RED.
    d. Straight-through GREEN ARROW with CIRCULAR RED.
    The above combinations shall not be simultaneously displayed in 
different signal faces on any one approach unless:
    a. One of the signal faces is a turn signal controlling only a 
protected mode, and a RIGHT (LEFT) TURN SIGNAL sign (R10-10) (see 
Sections 4D.6 and 4D.7) is mounted adjacent to each such signal face.
    b. The signal faces are shielded, hooded, louvered, positioned, or 
designed so that the combination is not confusing to approaching road 
users.
    The straight-through, left-turn, and right-turn RED ARROWs and the 
straight-through YELLOW ARROW signal indications shall not be displayed 
on any signal face, either alone or in combination with any other 
indication.

4D.11  Application of Flashing Signal Indications

Standard:
    The light source of a flashing signal indication shall be flashed 
continuously at a rate of not less than 50 nor more then 60 times per 
minute. The illuminated period of each flash shall be not less than 
half and not more than two-thirds of the total flash cycle.
    Flashing indications shall comply with the requirements of other 
sections of this manual regarding shielding or positioning of the 
display of conflicting signal indications except that flashing yellow 
indications for through traffic

[[Page 73660]]

shall not be required to be shielded or positioned to prevent visual 
conflict for road users in separately-controlled turn lanes.
    The following applications shall apply whenever a traffic control 
signal is operated in the flashing mode:
    a. Each approach or protected mode turn movement that is controlled 
during steady mode (stop-and-go) operation shall display a signal 
indication during flashing operation.
    b. All signal faces that are flashed on an approach shall flash the 
same color, either yellow or red, except that separate signal faces for 
protected mode turn movements shall be permitted to flash a CIRCULAR 
RED indication when the through indications are flashed yellow.
    c. The appropriate YELLOW ARROW indication shall be flashed when a 
signal face contains a YELLOW ARROW and a GREEN ARROW.
    d. If a signal face includes both circular and arrow lenses of the 
color that is to be flashed, only the circular indication shall be 
flashed.
    When a traffic control signal is operated in the flashing mode, a 
flashing yellow indication should be used for the major roadway and a 
flashing red indication should be used for the other approaches unless 
flashing red indications are used on all approaches.

4D.15 Number and Location of Signal Faces by Approach

Support:
    Sections 4D.5, 4D.17, and 4D.18 contain additional information 
regarding the design of signal faces.
Standard:
    The signal faces for each approach to an intersection or a mid-
block location shall be provided as follows:
    a. A minimum of two signal faces shall be provided:
    (1) For through traffic.
    (2) For one of the turning movements (left or right) if no through 
movement exists, such as on the stem approach to a T intersection.
    b. See Section 4D.6 for left-turn signal indications.
    c. See Section 4D.7 for right-turn signal indications.
    d. Except where the width of an intersecting roadway or other 
conditions make it physically impractical,
    (1) A signal face installed to satisfy paragraphs b and c above and 
at least one and preferably both of the signal faces required by 
paragraph a above shall be located:
    (a) Not less than 12 m (40 ft) beyond the stop line.
    (b) Not more than 45 m (150 ft) beyond the stop line unless a 
supplemental near side signal face is provided.
    (c) As near as practicable to the line of the driver's normal view, 
if mounted over the roadway.
    (2) A signal face installed to satisfy paragraphs b and c above and 
at least one and preferably both of the signal faces required by 
paragraph a above shall be located no higher than at a maximum height 
to the top of the signal housing mounted over a roadway of 7.8 meters 
(25.6 feet) above the pavement. For viewing distances between 12 meters 
(40 feet) and 16 meters (53 feet) from the stop line, the maximum 
mounting height to the top of the signal housing shall be as shown on 
Figure 4-5.
    (3) At least one and preferably both of the signal faces required 
by paragraph a above shall be located between two lines intersecting 
with the center of the approach at a point 3 m (10 ft) behind the stop 
line, one making an angle of approximately 20 degrees to the right of 
the center of the approach extended, and the other making an angle of 
approximately 20 degrees to the left of the center of the approach 
extended (see Figure 4-6).
    (4) If both of the signal faces required by paragraph a above are 
on mounted-posts, they shall both be on the far sides of the 
intersection, one of the right and one on the left of the approach 
lane(s).
    e. If the minimum sight distance in Table 4-2 cannot be met, sign 
shall be erected to warm approaching traffic of the signal.
    f. Required signal faces for through traffic on any one approach 
shall be placed not less than 2.5 m (8 ft) apart measured horizontally 
between the centers of the signal faces.
    g. If more than one turn signal face is provided for a protected-
mode turn, the signal faces shall be placed not less than 2.5 m (8 ft) 
apart measured horizontally between the centers of the signal faces.
    h. If supplemental signal faces are used, the following limitations 
shall apply:
    (1) Left-turn arrows shall not be used in near-right signal faces.
    (2) Right-turn arrows shall not be used in far-left signal faces. A 
far-side median mounted signal face shall be considered a far-left 
signal for this application.

[[Page 73661]]

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[[Page 73664]]



                   Table 4-2.--Minimum Sight Distance
------------------------------------------------------------------------
                 85th-Percentile Speed                    Minimum Sight
-------------------------------------------------------     Distance
                                                       -----------------
                     km/h                        mph     meters    feet
------------------------------------------------------------------------
30...........................................       20       50      175
40...........................................       25       65      215
50...........................................       30       85      270
60...........................................       35      100      325
60...........................................       40      120      390
70...........................................       45      140      460
80...........................................       50      165      540
90...........................................       55      195      625
100..........................................       65      220      715
------------------------------------------------------------------------

Guidance:
    The two signal faces required for each approach should be 
continuously visible to traffic approaching the traffic control signal, 
from a point at least the minimum sight distance indicated in Table 4-2 
in advance of and measured to the stop line. This range of continuous 
visibility should be provided unless precluded by a physical 
obstruction or unless another signalized location is within this range.
    If two or more left-turn lanes are provided for a separately-
controlled exclusive mode only left-turn movement or if a left-turn 
movement represents the major movement from an approach, two left-turn 
signal faces should be provided.
    If two or more right-turn lanes are provided for a separately-
controlled right-turn movement, or if a right-turn movement represents 
the major movement from an approach, two right-turn signal faces should 
be provided.
    Near-side signal faces should be located as near as practicable to 
the stop line.
    If a signal face controls a specific lane or lanes of approach, its 
position should make it readily visible to road users making that 
movement.
    Supplemental signal faces should be used if an engineering study 
has shown that they are needed to achieve visibility both in advance 
and immediately before the signalized location. If supplemental signal 
faces are used, they should be located to provide optimum visibility 
for the movement to be controlled.
    At signalized mid-block crosswalks, at least one of the signal 
faces should be over the traveled roadway for each approach.
    Option: If a sign is erected to warn approaching road users who do 
not have a continuous view of at least one signal indication for the 
minimum sight distance, the sign may be supplemented by a warning 
beacon. (See Section 4J.2.)
    A warning beacon used in this manner may be interconnected with the 
traffic signal controller assembly in such a manner as to flash yellow 
during the period when road users passing this beacon at the legal 
speed for the roadway, may encounter a red indication upon arrival at 
the signalized location.

4D.16  Number and Arrangement of Sections in Signal Faces

Standard:
    Each signal face shall have not more than five signal sections.
    Each signal face shall have at least three signal sections except 
under the following circumstances:
    a. If pedestrian signal indications are present.
    b. A single-section signal face consisting of a continuously 
illuminated GREEN ARROW lens that is being used to indicate a 
continuous movement.
    c. A dual arrow signal section that is being used to display a 
GREEN ARROW and a YELLOW ARROW indication alternately.
    d. A signal face used for a ramp control signal.
    Arrows shall be pointed
    a. Vertically upward to indicate a straight-through traffic 
movement.
    b. Horizontally in the direction of the turn to indicate a turn at 
approximately or greater than a right angle.
    c. Upward with a slope at an angle approximately equal to that of 
the turn if the angle of the turn is substantially less than a right 
angle.
    The lenses in a signal face shall be arranged in a vertical or 
horizontal straight line, except that in a vertical array, lenses of 
the same color may be arranged horizontally adjacent to each other at 
right angles to the basic straight line arrangement. Such clusters 
shall be limited to two identical lenses or to two or three different 
lenses of the same color.
    In each signal face, all red lenses in vertical faces shall be 
located above, and in horizontal faces shall be located to the left, of 
all yellow and green lenses.
    A yellow lens shall be located between the red lens or lenses and 
all other lenses.
    In vertically-arranged signal faces, each YELLOW ARROW lens shall 
be located immediately above the GREEN ARROW lens to which it applies. 
If a variable-indication signal section is used, the lens shall be in 
the same position relative to other lenses as are the GREEN ARROW 
lenses in a vertical signal face.
    In horizontally-arranged signal faces, the YELLOW ARROW lens shall 
be located immediately to the left of the GREEN ARROW lens. If a 
variable-indication signal section is used, the variable left-turn 
arrow lens shall be located immediately to the right of the CIRCULAR 
YELLOW lens, the straight-through GREEN ARROW lens shall be located 
immediately to the right of the CIRCULAR GREEN lens, and the variable 
right-turn arrow lens shall be located to the right of all other 
lenses.
    The relative positions of lenses within the signal face shall be as 
follows:
    a. In a vertical signal face from top to bottom:
CIRCULAR RED
CIRCULAR YELLOW
CIRCULAR GREEN
Straight-through GREEN ARROW
Left-turn YELLOW ARROW
Left-turn GREEN ARROW
Right-turn YELLOW ARROW
Right-turn GREEN ARROW
    b. In a horizontal signal face from left to right:
CIRCULAR RED
CIRCULAR YELLOW
Left-turn YELLOW ARROW
Left-turn GREEN ARROW
CIRCULAR GREEN
Straight-through GREEN ARROW
Right-turn YELLOW ARROW
Right-turn GREEN ARROW
    c. If adjacent indications in a cluster are not identical, their 
arrangement shall follow paragraph a or b above, as applicable.
    Option: In a vertical array cluster, identical signal indications 
may be repeated in adjacent horizontal locations within the same signal 
face.
    Horizontal and vertical signal faces may be used on the same 
approach provided they are separated to meet the lateral clearance 
required in Section 4D.15.
    Three hundred millimeter (12 in) lenses should be used for all 
signal indications for the following:
    a. Approaches with 85th-percentile approach speeds exceeding 65 km/
h (40 mph).
    b. Approaches where a traffic control signal might be unexpected.
    c. Arrows.
    d. All approaches without curbs and gutters where only signal heads 
mounted on post are used.
Support:
    Figure 4-7 illustrates some of the possible arrangements of lenses 
in signal faces.
Standard:
    Three-hundred millimeter (12-in) lenses shall be used:
    a. For signal indications for approaches (see definition in Section 
4A.6) where road users view both traffic control and lane-use control 
signal heads simultaneously.

[[Page 73665]]

    b. If the nearest signal face is between 35 m (120 ft) and 45 m 
(150 ft) beyond the stop line, unless a supplemental near-side signal 
indication is provided.
    c. When signal faces are located more than 45 meters (150 feet) 
from the stop line.
    d. For approaches to all signalized locations for which the minimum 
visibility distance in Table 4-2 cannot be met.
    e. For arrow signal sections.
Support:
    The use of 300 mm (12-in) lenses or higher intensity 200 mm (8-in) 
lenses can be used to assist older drivers in decision-making tasks 
further from the intersection where traffic density is lower and there 
are fewer potential conflicts with other vehicles.

BILLING CODE 4910-22-M

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BILLING CODE 4910-22-C

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4D.17  Visibility, Shielding, and Positioning of Signal Faces

Standard:
    The primary consideration in signal face placement and adjustment 
shall be to optimize the signals visibility to approaching traffic. 
Road users approaching a signalized intersection or other signalized 
area, such as a mid-block crosswalk, shall be given a clear and 
unmistakable indication of their right-of-way assignment.
    The geometry of each intersection to be signalized, including 
vertical grades, horizontal curves, and obstructions as well as the 
lateral and vertical angles of sight toward a signal face, as 
determined by typical driver-eye position, shall be considered in 
determining the vertical, longitudinal, and lateral position of the 
signal face.
    If the sight distance to the signal heads facing the approach is 
limited by horizontal or vertical alignment, the signal faces shall be 
aimed at a point on the approach at which the signal indication first 
becomes visible.
    In cases where irregular intersection geometric design necessitates 
placing signal faces for different roadway approaches with a 
comparatively small angle between their respective lenses, each signal 
lens shall, to the extent practicable, be shielded or directed by 
signal visors, louvers, or other means so that an approaching road user 
can see only the lens(es) controlling movements on the road user's 
approach.
    The bottom of the signal housing and any related attachments to a 
vehicle face located over a roadway shall be at least 4.6 meters (15 
feet) above the pavement. The top of the signal housing of a vehicle 
signal face located over a roadway shall not be more than 7.8 meters 
(25.6 feet) above the pavement.
    Signal visors exceeding 300 mm (12 in) in length shall not be used 
on free-swinging signal heads.
    The bottom of the housing of a vehicle signal face mounted or 
suspended over a roadway shall be at least 4.6 meters (15 feet) but not 
more than 5.8 meters (19 feet) above the pavement.
    The bottom of the signal housing of a vehicle signal face, not 
mounted or suspended over a roadway.
    a. Shall be at least 2.5 m (8 ft) but not more than 5.8 m (19 ft) 
above the sidewalk or, if there is no sidewalk, above the pavement 
grade at the center of the roadway.
    b. Shall be at least 1.4 m (4.5 ft) but not more than 5.8 m (19 ft) 
above the median island grade of a center median island if located on 
the near side of the intersection.
    Supports for post-mounted signal heads at the side of a roadway 
with curbs shall have a horizontal clearance of not less than 0.6 m (2 
ft) from the face of a vertical curb.
    If there is no curb, supports for post-mounted signal heads shall 
have a horizontal clearance of not less than 0.6 m (2 ft) from the edge 
of a shoulder.
Guidance:
    On medians, the above minimum clearances for signal supports should 
be obtained if practicable.
    There should be legal authority to prohibit the display of any 
unauthorized sign, signal, marking, or device that interferes with the 
effectiveness of any official traffic control device. Specific 
reference is made to Section 11-205, Uniform Vehicle Code (latest 
edition).
    In the interest of safety:
    a. Reference should be made to the American Association of State 
Highway and Transportation Officials (AASHTO) Roadside Design Guide.
    b. Signal supports should be placed as far as practicable from the 
edge of the traveled way without adversely affecting the visibility of 
the signal indications.
    Where supports cannot be located with the required clearances, 
consideration should be given to the use of breakaway designs or guard 
shielding barriers.
    No part of a concrete base for a signal support should extend more 
than 100 mm (4 in) above the ground level at any point. This limitation 
does not apply to the concrete base for a rigid (non-breakaway) 
support.
    c. A signal support or controller cabinet should not obstruct the 
sidewalk, or access from the sidewalk to the crosswalk.
    d. Controller cabinets should be located as far as practicable from 
the edge of the roadway.
    Signal visors should be used on signal faces to aid in directing 
the signal indication specifically to approaching traffic, as well as 
to reduce ``sun phantom'' which results when external light enters the 
lens.
    In general, vehicular signal faces should be aimed so that the 
continuation of the optical axis of the signal sections passes through 
a point on the approach that is located at least the minimum sight 
distance from the stop line and at driver's eye height.
    A backplate for target value enhancement should be used on signal 
faces viewed against bright sky or bright or confusing backgrounds.
Support:
    The use of back-plates of a size (width) three times the diameter 
of the signal can be used to assist older drivers in decision-making 
tasks further from an intersection where the traffic density is lower 
and there are fewer potential conflicts with other vehicles. The use of 
back-plates also enhances the contrast between the traffic signals and 
their surroundings for both daytime and nighttime conditions.
    Option: In some instances road users may be misdirected when two 
different signal indications on different signal faces are 
simultaneously visible. In these instances, a visibility-limited signal 
face may be used.

4E.4  Size, Design, and Illumination of Pedestrian Signal Head 
Indications

Standard:
    All new pedestrian signal head indications shall be displayed 
within a rectangular background and shall consist of symbolized 
messages. Symbol designs are set forth in the Standard Highway Signs. 
Existing pedestrian signal head indications with lettered messages may 
be retained for the remainder of their useful service life. Each 
indication shall be independently illuminated and emit a single color. 
(See Figure 4-8.)
    The DON'T WALK signal section shall be mounted directly above or 
integral with the WALK signal section.
    The WALK indication shall be white, conforming to the document 
entitled Pedestrian Traffic Control Signal Indications1, 
with all except the symbols obscured by an opaque material.
---------------------------------------------------------------------------

    \1\ Available in, ``Equipment and Material Standards of the 
Institute of Transportation Engineers,'' see Preface.
---------------------------------------------------------------------------

    The DON'T WALK indication shall be Portland orange conforming to 
the Pedestrian Traffic Control Signal Indications2, with all 
except the symbols obscured by an opaque material.
---------------------------------------------------------------------------

    \2\ Ibid.
---------------------------------------------------------------------------

    When not illuminated, the WALK and DON'T WALK symbols shall not be 
readily visible to pedestrians at the far end of the crosswalk that the 
signal head indications control.
Guidance:
    Pedestrian signal head indications should be conspicuous and 
recognizable to pedestrians at all distances from the beginning of the 
controlled crosswalk to a point 3 m (10 ft) from the end of the 
controlled crosswalk during both day and night.
    For crosswalks where the pedestrian enters the crosswalk more than 
30 m (100 ft) from the pedestrian signal head

[[Page 73668]]

indications, the symbols should be at least 225 mm (9 in) high.
    For pedestrian signal head indications, the symbols shall be at 
least 150 mm (6 in) high.

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4E6.  Accessible Pedestrian Signals

Support:
    The primary technique that people who have visual disabilities use 
to cross streets at signalized locations is to initiate their crossing 
when they hear the traffic alongside them begin to move, corresponding 
to the onset of the green interval. The effectiveness of this technique 
is reduced by several factors including: increasingly quiet cars, right 
turn on red (which masks the beginning of the through phase), complex 
signal operations, and wide streets. Further, low traffic volumes make 
it difficult for pedestrians who have visual disabilities to discern 
signal phase changes.
    Local organizations providing support services to pedestrians who 
have visual and/or hearing disabilities can often act as advisors to 
the engineer when consideration is being given to the installation of 
devices to assist such pedestrians. Orientation and mobility specialist 
or similar staff might be able to provide a wide range of advice. 
Information might range from assessing the needs of a single individual 
to commenting on the operation of proposed devices. \3\
---------------------------------------------------------------------------

    \3\ For guidance relative to techniques for making pedestrian 
signal information accessible to persons with visual impairment, 
including directly audible tones, transmitted speech messages, and 
vibration, refer to U.S. Access Board Document A-37b ``Accessible 
pedestrian Signals'' and the Federal Highway Administration.
---------------------------------------------------------------------------

Standard:
    When used, accessible pedestrian signals (see Section 4D.3) which 
provide information in non-visual format (including audible tones, 
verbal messages, and/or vibrotactile information), shall be used in 
combination with pedestrian signal timing. Accessible pedestrian 
signals shall clearly indicate the direction of the pedestrian crossing 
served by devices, such as the tactile arrows.
    Under stop-and-go operations, accessible pedestrian signals shall 
not be limited in operation by the time of day or day of week.
Guidance:
    The installation of accessible pedestrian signals at signalized 
intersections should be based on an engineering study, which should 
consider the following factors:
    a. Potential demand for accessible pedestrian signals.
    b. A request for accessible pedestrian signals.
    c. Traffic volumes during times when pedestrians might be present; 
including periods of low traffic volumes or high turn-on-red volumes.
    d. The complexity of traffic signal phasing.
    e. The complexity of intersection geometry.
Support:
    Technology that provides different sounds for each non-concurrent 
signal phase has frequently been found to provide ambiguous 
information.
Standard:
    When choosing audible tones, possible extraneous sources of sounds 
(such as wind, rain, vehicle back-up warnings, or birds) shall be 
considered in order to eliminate potential confusion to pedestrians who 
have visual disabilities.
Guidance:
    Audible pedestrian tones should be carefully selected to avoid 
misleading pedestrians who have visual disabilities when the following 
conditions exist:
    a. Where there is an island that allows unsignalized right turns 
across a crosswalk between the island and the sidewalk.
    b. Where multi-leg approaches or complex signal phasing require 
more than two pedestrian phases, such that it may be unclear which 
crosswalk is served by each audible tone.
    c. At intersections where a diagonal pedestrian crossing is 
allowed, or where one street receives a WALK indication simultaneously 
with another street.
Standard:
    When accessible pedestrian signals have an audible tone(s), they 
shall have a tone for the WALK interval. The WALK interval tone shall 
have a faster repetition rate than the associated pushbutton locator 
tone. The audible tone(s) shall be audible from the beginning of the 
associated crosswalk.
Support:
    A pushbutton locator tone is a repeating sound that informs 
approaching pedestrians that they are required to push a botton to 
actuate a WALK signal and that enables pedestrians who have visual 
disabilities to locate the pushbutton. (See Section 4E.8)
Guidance:
    The accessible WALK signal tone should be no louder than the 
locator tone, except when there is optional activation to provide a 
louder signal tone for a signal pedestrian phase. (See Section 4.E.8)
    Automatic volume adjustment in response to ambient traffic sound 
level should be provided up to a maximum volume of 89dB. \4\ Where 
automatic volume adjustment is used, tones should be no more than 5dB 
louder than ambient sound.
---------------------------------------------------------------------------

    \4\ Measurement of Highway-Related Noise, FHWA-PD-96-046, DOT-
UNTSC-FHWA-96-5. Available through the National Technical 
Information Service, see Preface.
---------------------------------------------------------------------------

Standard:
    When verbal messages are used to communicate the pedestrian 
interval, they shall provide a clear message that the WALK interval is 
in effect, as well as to which crossing it applies.
    The verbal messages that is provided at regular intervals 
throughout the timing of the WALK interval shall be the term `walk 
sign,'' which may be followed by the name of the street to be crossed.
    A verbal message is not required at times when the WALK interval is 
not timing, but, if provided:
    a. It shall be the term ``wait.''
    b. It need not be repeated for the entire time that the WALK 
interval is not timing.
    Option: Accessible pedestrian signals that provide verbal messages 
may provide similar messages in languages other than English, if 
needed, except for the terms ``walk sign'' and ``wait.''
Standard:
    A vibrotactile pedestrian device communicates information about 
pedestrian signal phasing through a vibrating surface by touch. 
Vibrotactile pedestrian devices, where used, shall indicate that the 
WALK interval is in effect, and for which direction it applies, through 
the use of a vibrating directional arrow or some other means.
Guidance:
    When provided, vibrotactile pedestrians devices should be located 
next to, and on the same pole as, the pedestrian pushbuttom, if any, 
and adjacent to the intended crosswalk.

4E.8  Accessible Pedestrian Signal Detectors

Standard:
    At accessible pedestrian signal locations with pedestrian 
actuation, each pushbutton shall activate both the WALK interval and 
the accessible pedestrian signals.
Guidance:
    At accessible pedestrian signal locations, pushbuttons should 
clearly indicate which crosswalk signal is actuated by each pushbutton. 
Pushbuttons and tactile arrows should

[[Page 73671]]

have high visual contrast.\5\ Tactile arrows should point in the same 
direction as the associated crosswalk. At corners of signalized 
locations with accessible pedestrian signals where two pedestrian 
pushbuttons are provided, the pushbuttons should be separated by a 
distance of at least 3 meters (10 feet). This enables pedestrians who 
have visual disabilities to distinguish and locate the appropriate 
pushbutton.
---------------------------------------------------------------------------

    \5\ See Department of Justice Americans with Disabilities Act 
Standards for Accessible Design.
---------------------------------------------------------------------------

    Pushbuttons for accessible pedestrian signals should be located as 
follows:
    a. Adjacent to a level all-weather surface to provide access from a 
wheelchair, and where there is an all-weather surface, wheelchair route 
to the ramp.
    b. Within 1.5 meters (5 feet) of the crosswalk extended.
    c. Within 3 meters (10 feet) of the edge of the curb, shoulder, or 
pavement.
    d. Parallel to the crosswalk to be used (see Figure 4-9).
    If the pedestrian clearance time is sufficient only to cross from 
the curb or shoulder to a median of sufficient width for pedestrians to 
wait and accessible pedestrian detectors are used, an additional 
accessible pedestrian detector should be provided in the median.
Standard:
    Pushbutton locator tones shall be highly locatable and shall repeal 
at one-second intervals.
Guidance:
    Pushbuttons should be audible locatable. Pushbutton locator tones 
should be intensity responsive to ambient sound, and be audible 2 to 4 
meters (6 to 12 feet) from the pushbutton, or to the building line, 
whichever is less. Pushbutton locator tones should be no more than 5 dB 
louder than ambient sound.
    Pushbutton locator tones should be deactivated during flashing 
operation of the traffic control signal.
    Option: At locations with pre-timed traffic signals or non-actuated 
approaches, pedestrian pushbuttons may be used to activate the 
accessible pedestrian signals.
    The audible tone(s) may be made louder (up to a maximum of 89dB) by 
holding down the pushbutton for a minimum of 3 seconds. The louder 
audible tone(s) may also alternate back and forth across the crosswalk, 
thus providing optimal directional information.
    The name of the street to be crossed may also be provided in 
accessible format, such as braille, or raised print.

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[[Page 73673]]

4E.9  Pedestrian Intervals and Phases

Standard:
    When pedestrian signal heads are used, a WALK indication shall be 
displayed only when pedestrians are permitted to leave the curb or 
shoulder.
    A pedestrian clearance time shall begin immediately following the 
WALK indication. The pedestrian clearance time shall consist of a 
pedestrian change interval during which a flashing DON'T WALK 
indication shall be displayed.
    At intersections equipped with pedestrian signals, the pedestrian 
signal indications shall be displayed except when the vehicular traffic 
control signal is being operated as a flashing device. At those times, 
the pedestrian signal indications shall not be displayed.
Guidance:
    The walk interval should be at least 7 seconds in length so that 
pedestrians will have adequate opportunity to leave the curb or 
shoulder before the pedestrian clearance time begins.
    The pedestrian clearance time should be sufficient to allow a 
pedestrian crossing in the crosswalk to leave the curb or shoulder and 
travel at a normal walking speed of 1.2m (4 feet) per second, to at 
least the far side of the farthest traveled lane or to a median of 
sufficient width for a pedestrian to wait. Where significant numbers of 
pedestrians who walk slower than normal routinely use the crosswalk, a 
walking speed of less than 1.2 (4 feet) per second should be considered 
in determining the pedestrian clearance time.
    Option: An alternative to using a lower walking speed to determine 
the pedestrian clearance time is to employ the use of passive 
pedestrian detection equipment in the crosswalks. Such equipment can 
detect pedestrians who need more time to complete their crossing. The 
equipment extends the length of the pedestrian clearance time for that 
cycle to allow pedestrians to complete their crossing before cross 
traffic begins.
Guidance:
    Where the pedestrian clearance time is sufficient only for crossing 
from the curb or shoulder to the median, additional measures should be 
considered, such as median-mounted pedestrian signals, staggered 
crosswalks, or additional signing.
    Option: Pedestrian clearance time may include the yellow change 
interval, if used, and the red clearance interval, if used.
    If pedestrian volumes and characteristics do not require a 7-second 
walk interval, walk intervals as short as 4 seconds may be used.
    On a roadway with a median of sufficient width for pedestrians to 
wait, a pedestrian clearance time that allows the pedestrian to cross 
only from the curb or shoulder to the median may be provided.
    During the transition into preemption, the walk interval and the 
pedestrian change interval may be shortened or omitted as described in 
Sections 4D.13 and 8C.6.
Support:
    The walk interval itself need not equal or exceed the pedestrian 
clearance time calculated for the roadway width, because many 
pedestrians will complete their crossing during the pedestrian 
clearance time.

4J.3  Design of Lane-use Control Signals

Standard:
    All lane-use control signal indications shall be in units with 
rectangular signal faces and shall have opaque backgrounds. Nominal 
minimum height and width of each downward GREEN ARROW, YELLOW X, and 
RED X signal face shall be 450 mm (18 inches) for typical applications. 
The WHITE two-way and one-way left-turn ARROW signal indications shall 
have a nominal minimum height and width of 750 mm (30 inches).
    Each lane to be reversed or closed shall have signal faces with a 
downward GREEN ARROW and a RED X symbol.
    Each reversible lane that also operates as a two-way or one-way 
left-turn lane during certain periods shall have signal faces that also 
include the applicable WHITE two-way or one-way left-turn ARROW symbol.
    Each nonreversible lane immediately adjacent to a reversible lane 
shall have signal indications that display a downward GREEN ARROW to 
traffic traveling in the permitted direction and a RED X to traffic 
traveling in the opposite direction.
    If in separate units, the relative positions, from left to right, 
of the indications shall be RED X, YELLOW X, downward GREEN ARROW, two-
way left-turn ARROW, one-way left-turn ARROW.
    The color of lane-use control signal indications shall be clearly 
visible for 700 m (2300 ft) at all times under normal atmospheric 
conditions, unless otherwise physically obstructed.
    Lane-use control signal units shall be located approximately over 
the center of the lane controlled.
    If the area to be controlled is more than 700 m (2300 ft) in 
length, or if the vertical or horizontal alignment is curved, 
intermediate lane-use control signal indications shall be placed over 
each controlled lane at frequent intervals. This placement shall be 
such that road users will at all times be able to see at least one 
indication and preferably two along the roadway, and will have a 
definite indication of the lanes specifically reserved for their use.
    All lane-use control signal faces shall be located in a straight 
line across the roadway approximately at right angles to the roadway 
alignment.
    The bottom of any lane-use control signal unit shall be at least 
4.6 m (15 ft) but not more than 5.8 m (19 ft) above the pavement grade.
    On roadways having intersections controlled by traffic control 
signals, the lane-use control indication shall be placed sufficiently 
far in advance of or beyond such traffic control signals to prevent 
them from being misconstrued as traffic control signals.
Guidance:
    In highly-developed commercial environments, signal faces with 
nominal height and width of 450 mm (18 in) or larger should be 
considered for additional target value.
    Option: In areas with minimal visual clutter and with speeds of 70 
km/h (40 mph) or less, lane-use control signal faces with nominal 
height and width of 300 mm (12 inches) may be used.
    Other sizes of lane-use control signal faces with message 
recognition distances appropriate to signal spacing may be employed for 
unusual applications.
    Signal faces with a YELLOW X symbol on an opaque background may be 
provided for operation as described in Section 4J.4.
    Nonreversible lanes not immediately adjacent to a reversible lane 
on any street so controlled may also be provided with signal 
indications that display a downward GREEN ARROW to traffic traveling in 
the permitted direction and a RED X to traffic traveling in the 
opposite direction.
    The indications provided for each lane may be in separate units or 
may be superimposed in the same unit.

4L  IN-ROADWAY LIGHTS

4L.1  Application of In-Roadway Lights

Support:
    In-Roadway Lights are special types of highway traffic signals 
installed in the roadway surface to warn road users that they are 
approaching a condition on or adjacent to the roadway that might not be 
readily apparent and might require the road users to slow down and

[[Page 73674]]

possibly come to a stop. This includes, but is not necessarily limited 
to, situations warning of marked school crosswalks, marked mid-block 
crosswalks, marked crosswalks on uncontrolled approaches, and other 
roadway situations involving pedestrian crossings.
Standard:
    In-Roadway Lights shall not exceed a height of 20 millimeters (\3/
4\ inches) above the roadway surface.
    Option: The flash rate for In-Roadway Light may be different than 
the flash rate of standard beacons.

4L.2  In-Roadway Warning Lights at Crosswalks

Standard:
    In-Roadway Warning Lights at crosswalks shall be installed only at 
marked crosswalks with applicable warning signs. They shall not be used 
at crosswalks controlled by YIELD signs, STOP signs or traffic control 
signals.
    In-Roadway Warning Lights at crosswalks shall be installed along 
both sides of the crosswalk and shall span its entire length.
    In-Roadway Warning Lights at crosswalks shall initiate operation 
based on pedestrian actuation and shall cease operation at a 
predetermined time after the pedestrian actuation or with passive 
detection after the pedestrian clears the crosswalk.
    In-Roadway Warning Lights at crosswalks shall display a flashing 
yellow indication when actuated. The flash rate for In-Roadway Warning 
Lights at crosswalks shall be at least 50 flash periods per minute. The 
flash rate shall not be between 5-30 flashes per second to avoid 
frequencies that might cause seizures.
    For one-lane, one-way roadways, a minimum of two In-Roadway Warning 
Lights shall be installed on the approach side of the crosswalk. For 
two-lane roadways, a minimum of three In-Roadway Warning Lights shall 
be installed along both sides of the crosswalk. For roadways with more 
than two lanes, a minimum of one In-Roadway Light per lane shall be 
installed along both sides of the crosswalk.
    In-Roadway Warning Lights shall be installed within 3 meters (10 
feet) of the outside edge of the crosswalk. In-Roadway Warning Lights 
shall face away from the crosswalk if uni-directional, or shall face 
away from and across the crosswalk if bi-directional.
Guidance:
    The period of operation of the In-Roadway Warning Lights following 
each actuation should be sufficient to allow a pedestrian crossing in 
the crosswalk to start crossing the traveled way and travel at a normal 
walking speed of 1.2 meters (4 feet) per second to at least the far 
side of the traveled way or to a median of sufficient width for 
pedestrians to wait. Where significant numbers of pedestrians who walk 
slower than normal routinely use the crosswalk, a walking speed of less 
than 1.2 m (4 feet) per second should be considered in determining the 
period of operation.
    Where the period of operation is sufficient only for crossing from 
a curb or shoulder to a median of sufficient width for pedestrians to 
wait, additional measures should be considered, such as median-mounted 
pedestrian actuators.
    The location of the In-Roadway Warning Lights within the lanes 
should be based on engineering judgment.
    Option: On one-way streets, In-Roadway Warning Lights may be 
omitted on the departure side of the crosswalk.
    Based on engineering judgment, the In-Roadway Warning Lights on the 
departure side of the crosswalk on the left side of a median may be 
omitted.
    In-Roadway Warning Lights may be installed in the center of each 
travel lane, at the centerline of the roadway, at each edge of the 
roadway or parking lanes, or at other suitable locations.
    Unidirectional In-Roadway Warning Lights installed at crosswalk 
locations may have a yellow light indication in each unit that is 
visible to pedestrians in the crosswalk. These lights may flash with 
and at the same flash rate as the light head in which each is 
installed.
[FR Doc. 99-33403 Filed 12-29-99; 8:45 am]
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