[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.
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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 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.
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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);
[[Page 73646]]
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.
BILLING CODE 4910-22-M
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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 73662]]
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[[Page 73663]]
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BILLING CODE 4910-22-C
[[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
[[Page 73666]]
[GRAPHIC] [TIFF OMITTED] TP30DE99.025
BILLING CODE 4910-22-C
[[Page 73667]]
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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[[Page 73669]]
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BILLING CODE 4910-22-C
[[Page 73670]]
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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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]
BILLING CODE 4910-22-M