Pedestrian Signal Safety - AAA Foundation for Traffic Safety

As shown in Table E-12, major street delay increased exponentially with the increase in traffic volume
for the 3.00 ft./sec. walking speed. There was no change in LOS (LOS D remained the same) under
existing volume conditions as compared to a modeled increase of 10 percent above existing volumes
for the 3.50 ft./sec. and 4.00 ft./sec. walking speed scenarios. The range in ADPV was from 42 sec. to
54 sec.
For the minor street approach, there was no change in LOS (LOS D remained the same) under
existing volume conditions as compared to a modeled increase of 10 percent above existing volumes
for the 3.50 ft./sec. and 4.00 ft./sec. walking speed scenarios. The range in ADPV was from 41 sec. to
49 sec. Minimum green time required for the concurrent traffic along the minor street approaches was
less than the pedestrian clearance time required to cross the crosswalks. Additional green time based
on the pedestrian clearance time was acquired from the major street green times.
Table E-12. Montgomery County, Maryland intersection characteristics: approach lane usage, peakhour
traffic volumes, and cycle length.
Appro ach
Northbound
(MN)
Southbound
(MN)
Eastbound
(MJ)
Westbound
(MJ)
MJ
approach
MN
approach
Number of approach lanes
L LT T TR R Total
-10
percent
Peak-hour tra ffic vol um es
(existing and m odeled)
-5 percent Existing
+5
percent
+10
percent
1 1 0 1 0 3 338 357 376 395 414
1 0 2 0 1 4 230 242 255 268 281
1 0 3 0 1 5 768 810 853 892 934
1 0 2 1 0 4 1,248 1,318 1,387 1,456 1,526
2 0 5 1 1 9 2,016 2128 2,240 2352 2,464
Vol ume
range
2,016 –
2,464
2 1 2 1 1 7 568 599 631 663 694 568 –694
Total 4 1 7 2 2 16 2,584 2,727 2,871 3,015 3,158
Cycl e len gth: 150 sec.
* Note: L = left; LT = left-through; T = through; TR = through-right; R = right.
2,584 –
3,158
169