Pedestrian Signal Safety - AAA Foundation for Traffic Safety

There was no change in overall LOS (LOS C remained the same) when comparing the modeled
decrease in volumes of -10 percent of existing volumes to a modeled increase of 15 percent above
existing volumes. There was a maximum increase of 4 sec. in ADPV under any of the volume or
walking speed scenarios when comparing existing volume conditions to a modeled increase of 15
percent above existing volumes. The graph included in Figure 12 shows there was a uniform increase
in ADPV as peak-hour volumes increased.
A discussion of LOS and AVD for the major and minor approaches is included in Appendix G to this
report. Table G-12 and Figures G-4, G-5, and G-6 in Appendix G show intersection delay for major
and minor street approaches at walking speeds of 3.00, 3.50, and 4.00 ft./sec. at the Salt Lake City
case study intersection.
3 0 .0
2 7 .0
2 4 .0
2 1 .0
1 8 .0
1 5 .0
Utah
- 1 0 0 5 1 0 1 5
% V o lu m e D if f
Figure 12. Delay vs. volumes at Salt Lake City, Utah case study intersection for walking speeds of
3.00, 3.50, 4.00 ft./sec. and base conditions.
Table 20. Salt Lake City, Utah: Total intersection level of service and average delay per vehicle under
various volume and pedestrian walking speed scenarios.
Walking
speed
scenario
-10-percent
volume
LOS (and average delay, in sec.)
Existing
volume
+5-percent
volume
+10-percent
volume
B a s e
4 .0
3 .5
3 .0
+15-percent
volume
3.00 ft./sec. C (23) C (24) C (25) C (22) C (26)
3.50 ft./sec. C (23) C (24) C (24) C (25) C (26)
4.00 ft./sec. C (21) C (22) C (23) C (24) C (25)
71