Revisions to Part 4

1
Revisions to Part 4 Highway Traffic Signals
2
Section 4B.02Steps for signal removal changed
from option to guidance
- Installing a sign such as this is no longer one
of the steps in the process. - This is only one
of several possible legends for a sign, if used.
3
Section 4C.04New guidance in Warrant 3
(Peak hour)

• Signals installed under Warrant 3 (peak hour)
• should be traffic-actuated, and
• may be operated in flashing mode during off-peak
  hours

4
Section 4C.05Revisions to Warrant 4 (pedestrian
volume)
5
Sections 4C.05 4C.06Signals based only on
warrant 4 (ped volume) or warrant 5 (school
crossing) should also control the minor street or
driveway

• no half-signals

6
Section 4C.10 New Warrant 9 for intersections
near grade crossings
7
Reorganization of Sections in Chapter 4D

• Similar subjects grouped together
• in adjacent Sections, or
• combined into a single Section

8
Chapter 4DOptional use of flashing yellow arrow
for permissive turns
9
Optional use of flashing red arrow
for permissive turns
in special cases
10
Section 4D.03Use of No Pedestrian Crossing signs
at signalized locations
Where it is necessary or desirable to prohibit a
pedestrian movement that is not practical to
physically prevent by other means Sign should be
used (rather than may)
11
Section 4D.04 -- Meanings of Vehicular Signal
Indications

• Revised definition of Intersection (Sect.
  1A.13)--- at a location controlled by a traffic
  signal, these areas shall also be part of the
  intersection
• On approacharea beyond stop line or crosswalk
• On departurearea extending to far side of
  crosswalk

12
Section 4D.04 -- Meanings of Vehicular Signal
Indications

• Clarified meanings of flashing yellow and
  flashing red (circular and arrow) signal
  indications
• includes meanings for
  pedestrians facing
  these indications
• covers use of flashing
  circular or red as beacons
  supplementing another device

13
Sections 4D.06 4D.26Specific prohibitions of

• Flashing green
• Vehicular countdown displays
• Other similar pre-yellow signal displays
• Strobes or other flashing displays within or
  adjacent to any signal indication

14
Section 4D.06Optional U-turn arrow indications
15
Section 4D.0712-inch indications required for
all new traffic control signal faces

• Six options for using new 8-inch
  indications in special circumstances
• (incl. lt30 mph if lt120 ft from stop line)

16
Sections 4D.08 4D.09Optional red indication
clusters in vertical signal faces
17
Section 4D.11 Min. two signal faces required
for straight-through movement if it exists, even
if not the major movement on approach
2nd face required for through movement
18
Section 4D.11 Single-section
green arrow signal face OK when never a
conflicting movement
19
Section 4D.11 Recommended number, location, and
design of signal faces for approaches with speeds
gt 45 mph

• Face per thru lane, overhead, far side, with
  backplates

1 or more supplemental faces
20
Section 4D.11 Recommended number, location, and
design of signal faces for approaches with speeds
gt 45 mph
21
Section 4D.11 Recommended minimum number of
thru signal faces on approaches with speeds gt 45
mph
22
Same provisions should also be considered for
speeds of less than 45 mph
23
Section 4D.12 Optional yellow retroreflective
borders around backplates
24
Section 4D.13 Positioning of overhead separate
signal faces for turn movements

• If installed overhead for a dedicated turn lane,
  the separate turn face shall be located over the
  turn lane (not necessarily
  centered over the lane)

25
Section 4D.13Circular green indications for
permissive LTs should not be located over or in
front of the LT lane
26
Shared signal face for permissive-only mode left
turns
(Not over the left-turn lane)
27
Sections 4D.17 to 4D.20
Signal indications for left turns

• Elimination of provisions that allowed Dallas
  displays

28
Sections 4D.17 and 4D.21 -- Protected-only mode
shall not be used without exclusive turn lane
unless turn phase always begins and ends
simultaneously with the adjacent through movement
(split-phased)
NOT to be used with shared lane unless
split-phased
29
Section 4D.19 Protected-only mode left-turn
faces must use red arrow, not circular red

• Applies to left-turn signals but not to
  right-turn signals

30
Section 4D.19 Protected-only mode left-turn
faces must use red arrow, not circular red

• Applies to left-turn signals but not to
  right-turn signals

31
Sections 4D.17 thru 4D.24New sections figures
for modes of left-turn and right-turn signal
operations
Separate signal face with FYA for PPLT and/or
protected-only mode left turn
32
Section 4D.25 Signal displays for shared
left-turn/right-turn lanes with no through
movement
33
Section 4D.26 Yellow change intervals and red
clearance intervals

• Durations shall be determined using engineering
  practices
• Compliance date December 31, 2014 or when timing
  adjustments are made (whichever occurs first)
• Use of red clearance changed from option to
  guidance, when indicated by application of
  engineering practices

34
Section 4D.27Back-up power
should be provided for signals
with RR preemption
35
Section 4D.27 LRT signal indications may be
used for exclusive bus or BRT lanes or
bus queue jumper lanes
36
Section 4D.28Flashing mode may be used on a
scheduled basis
37
Section 4D.34 Overhead lane control signs
should be used for certain signalized approaches
Per Section 2B.19 Lane drops, multiple-lane
turns, shared through-turn lanes, other
unexpected lane-use
38
Section 4E.02 Revised legal meaning of flashing
upraised hand pedestrian signal indication

• If signal is timed to provide sufficient time for
  pedestrians to cross the entire highway -- legal
  right to cross entire divided highway without
  stopping at the median.
• If signal timing provides only enough time for
  pedestrians to cross to the median --
  median-mounted signs, ped signals, and
  pushbuttons (if actuated) are required.

39
Section 4E.02 New meaning of flashing upraised
hand when pedestrian countdown signals are
present was NOT ADOPTED
Ped may enter the intersection on the flashing
upraised hand when a countdown pedestrian signal
indication is present if they are able to travel
to the far side of the traveled way by the time
conflicting traffic receives a green signal
40
Section 4E.04 Overlaid pedestrian symbols are
allowed
41
Section 4E.06 Pedestrian intervals and signal
phases

• If a walking person or a flashing upraised hand
  is displayed
• A steady red or flashing red must be displayed
  to any conflicting vehicular movement that is
  perpendicular or nearly perpendicular to the
  crosswalk

Crosswalk w/ ped signals across signal-controlled
RT slot
42
Relationship of pedestrian clearance time to
vehicular intervals in the 2003 MUTCD
(Conflicting Phase)
(Parallel Vehicular Phase)
A Sec.
B Sec.
Calc. Ped. Clear. TIME (_at_4 fps etc.) must fit in
either A or AB

• Ped. Change INTERVAL (FL DW) may be DISPLAYED
  in either sequence, except that is
  reqd w/ countdown

STDY
FL
FL
43
Ped. Change Interval (FDW) shall end at least 3
seconds (buffer) before release of conflicting
traffic
Buffer shall not begin later than the start of
the red clearance interval, if used Compliance
date Dec. 31, 2014 or when timing adjustments are
made (whichever occurs first)
44
Section 4E.06 Slower walking speed for
calculating pedestrian clearance time (guidance)
4.0 feet per second
Ped. Clearance Time based on 3.5 feet / sec
Exception allows 4.0 ft /sec if extended button
press or passive ped detection allows slower peds
to request additional crossing time
Sum of Walk time Ped. Clearance Time based on
3.0 feet per second for distance from ped
detector to far side
45
Section 4E.06 Optional leading pedestrian
interval
46
Section 4E.07Countdown pedestrian displays

• Required for all ped signals except where ped
  change interval is lt 7 sec.
• No specific compliance date for retrofitting
  existing ped signals (can remain w/o countdown
  until ped heads replaced)
• May be used even if ped change interval is 7
  sec. or less

47
Section 4E.08 New guidance and figures for
locations of pedestrian pushbuttons for a variety
of conditions
48
Section 4E.08 Positioning of pedestrian
pushbuttons and legends on pushbutton signs shall
clearly indicate which crosswalk signal is
activated by which pushbutton
49
Accessible Pedestrian Signals (APS) and
Accessible Detectors combined and
reorganized into five new
sections

• 4E.09 General
• 4E.10 Location
• 4E.11 Walk indications
• 4E.12 Tactile arrows and locator tones
• 4E.13 Extended press button features

50
Sections 4E.09 through 4E.13 APS revised
provisions
Design features, extended button presses, audible
beaconing, special requirements if
two buttons must be located lt 10 ft apart or on
one pole
51
Reorganization of Chapters 4F-4N

• 4F Pedestrian Hybrid Beacons
• 4G Traffic Control Signals and Hybrid Beacons
  for Emergency Vehicle Access
• 4H Traffic Control Signals for One-Lane,
  Two-Way Facilities
• 4I Traffic Control Signals for Freeway Entrance
  Ramps
• 4J Traffic Control for Movable Bridges
• 4K Highway Traffic Signals at Toll Plazas
• 4L Flashing Beacons
• 4M Lane-Use Control Signals
• 4N In-Roadway Lights

52
Chapter 4FNew pedestrian hybrid beacon
53
Section 4G.04New emergency-vehicle
hybrid beacon
54
Sections 4I.02 and 4I.03Ramp control signals
Clarified design requirements and options
Recommended regulatory and warning signs
55
New Chapter 4K Highway traffic signals at toll
plazas
Section 4K.01 Signals at toll plazas
NO
OK
56
Section 4K.02 Lane-use control signals at toll
plazas
NO
YES
57
Section 4K.03 Warning beacons at toll
plazas
Optional lower mounting height on tollbooth
impact attenuators
Beacon emphasizing ETC account-only lane should
be separate from lane-use control signals
58
Section 4L.02 Intersection Control Beacons
using two red lenses
Horizontally aligned flash simultaneously
Vertically aligned flash alternately
59
Chapter 4N In-roadway lights
Shall be used only at marked crosswalks across
uncontrolled approaches
New sign required if lights are actuated by push
buttons