CRDC1401-CS170809 411111111111111111111111....1011111
8-9-17
City of Coppell
Denton Tap Road Signal Timing—Status Meeting
1. Summary of Traffic Volumes
2. Initial Travel-Time Run Data
3. Operating Schedule& Plans (SH 121 to Sandy Lake Road)
4. City Standards and Procedures
a. Yellow
b. All-Red (example:SLR lefts)
c. Pedestrian Intervals
i. Walk(reduce from 7 at certain locations?i.e.SLR)
ii. FDW(opportunities to reduce to 3.5fps across Denton Tap)
d. Extensions
5. Pedestrian Control & Intervals
a. Standards?
b. Opportunities?
6. Recommended Town Center Changes in Control &Sequence
a. Potential for MAX-2 operations during fine tuning
7. City's Vision/Expectations related to midday timing adjustments for Sandy Lake Road
intersection?
a. Currently coordinated on 3 approaches at 90-sec cycle
b. Observed to clear most movements most cycles during 2-hr noon peak
8. Proposed Timing Plans
9. Clock Sync/Communication Status in Corridor(each intersection, including SH 121)
10. Detection Status in Corridor(based on June 7 summary of observations)
11. Plan for Implementation & Fine Tuning
a. Provide timing plans to City
b. Receive printout of coded timing from database
c. Schedule for coding and field implementation/fine tuning
12. Other Items for Discussion
a. Surge in WB Parkway demand at 6:15 pm?
b. Potential Sandy Lake Road Offset impacts (AM and Midday)
c. Updated timing sheet for Parkway?
d. Significant Benefit from FYA operations(future NCTCOG funding?)
i. Sequences/Progression
ii. Double services of high-volume single lane left-turns
e. NCTCOG RTSRP II—Proposed intersections for inclusion?
•
•
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Page 520 2011 Edition-Revision 2
Figure 4E-2. Pedestrian Intervals
"Zero"point of
countdown display
Steady Flashing with countdown* Steady Steady
Pedestrian -�
Signal r>� ##_
Display /1 #–#
Pedestrian Walk Pedestrian Buffer
Intervals Interval Change Interval Interval
7 seconds 1 seconds
MIN.** —Calculated pedestrian clearance time*** MIN.
(see Section 4E.06)
Relationship to associated vehicular phase intervals:
w . ' /Yellow Change Interval=Buffer Interval `; , Y IIIMA■IIIS
Yellow Change Interval IIIIIIIIIIIIIIIIp
+Red Clearance Interval=Buffer Interval y. - Y R
Part of Yellow Change Interval Y R
+Red Clearance Interval=Buffer Interval
Red Clearance Interval=Buffer Interval ' G Y R MEIN.
Associated Green Interval extends G Y R
beyond end of Buffer Interval
Legend
* The countdown display is optional for Pedestrian Change Intervals of 7 seconds or less. G = Green Interval III
III
** The Walk Interval may be reduced under some conditions(see Section 4E.06). Y = Yellow Change Interval
*** The Buffer Interval,which shall always be provided and displayed,may be used to help (of at least 3 seconds)
satisfy the calculated pedestrian clearance time,or may begin after the calculated pedestrian R = Red Clearance Interval
clearance time has ended. Red = Red because
conflicting traffic has
been released
Option:
08 A walking speed of up to 4 feet per second may be used to evaluate the sufficiency of the pedestrian
clearance time at locations where an extended pushbutton press function has been installed to provide slower
pedestrians an opportunity to request and receive a longer pedestrian clearance time. Passive pedestrian
detection may also be used to automatically adjust the pedestrian clearance time based on the pedestrian's actual
walking speed or actual clearance of the crosswalk.
os The additional time provided by an extended pushbutton press to satisfy pedestrian clearance time needs may
be added to either the walk interval or the pedestrian change interval.
Guidance:
lo Where pedestrians who walk slower than 3.5 feet per second, or pedestrians who use wheelchairs, routinely
use the crosswalk, a walking speed of less than 3.5 feet per second should be considered in determining the
pedestrian clearance time.
11 Except as provided in Paragraph 12, 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.
Option:
12 If pedestrian volumes and characteristics do not require a 7-second walk interval, walk intervals as short as
4 seconds may be used.
Support:
13 The walk interval is intended for pedestrians to start their crossing. The pedestrian clearance time is
intended to allow pedestrians who started crossing during the walk interval to complete their crossing. Longer
Sect.4E 06 November 2012
Timings Town Center Sequence
3: DENTON TAP RD & TOWN CENTER DR 4 t PM Peak
/ \*
Lane Group EBL EBT WBL WBT NBL NBT NBR SBL SBT
Lane Configurations "j 1+ tft r t+T
Volume(vph) 50 25 120 20 125 2080 90 60 1055
Turn Type pm+pt NA pm+pt NA pm+pt NA Perm pm+pt NA
Protected Phases 3 8 7 4 1 6 5 2
Permitted Phases 8 4 6 6 2
Detector Phase 3 8 7 4 1 6 6 5 2
Switch Phase
Minimum Initial(s) 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0
Minimum Split(s) 10.5 10.5 10.5 10.5 10.5 11.5 11.5 10.5 11.5
Total Split(s) 18.0 45.0 18.0 45.0 22.0 80.0 80.0 17.0 75.0
Total Split(%) 11.3% 28.1% 11.3% 28.1% 13.8% 50.0% 50.0% 10.6% 46.9%
Yellow Time(s) 3.5 3.5 3.5 3.5 3.5 4.5 4.5 3.5 4.5
All-Red Time(s) 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0
Lost Time Adjust(s) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total Lost Time(s) 5.5 5.5 5.5 5.5 5.5 6.5 6.5 5.5 6.5
Lead/Lag Lead Lag Lead Lag Lead Lag Lag Lead Lag
Lead-Lag Optimize? Yes Yes Yes Yes
Recall Mode None None None None None Max Max None C-Max
Act Effct Green(s) 21.7 11.5 26.2 16.2 116.3 105.1 105.1 111.9 103.0
Actuated g/C Ratio 0.14 0.07 0.16 0.10 0.73 0.66 0.66 0.70 0.64
v/c Ratio 0.31 0.75 0.82 0.36 0.44 0.71 0.12 0.57 0.39
Control Delay 57.9 44.1 91.5 39.1 6.9 6.2 0.1 50.5 6.4
Queue Delay 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total Delay 57.9 44.1 91.5 39.1 6.9 6.2 0.1 50.5 6.4
LOS ED F D A A A D A
Approach Delay 47.7 73.4 5.9 8.9
Approach LOS D E A A
Intersection Summary
Cycle Length: 160
Actuated Cycle Length: 160
Offset: 127(79%), Referenced to phase 2:SBTL,Start of Yellow
Natural Cycle:80
Control Type:Actuated-Coordinated
Maximum v/c Ratio:0.82
Intersection Signal Delay: 12.6 Intersection LOS: B
Intersection Capacity Utilization 78.9% ICU Level of Service D
Analysis Period(min) 15
Splits and Phases: 3: DENTON TAP RD&TOWN CENTER DR
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