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Pedestrian Signal Safety - AAA Foundation for Traffic Safety

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Table H-13. Orange County, Cali<strong>for</strong>nia: intersection level of service under various peak-hour traffic<br />

volume and pedestrian walking speed scenarios.<br />

SUMMARY<br />

Walking<br />

speed scenario -10-percent<br />

volume<br />

LOS (and average delay, in sec.)<br />

Existing<br />

volume<br />

+5-percent<br />

volume<br />

+10-percent<br />

volume<br />

+15-percent<br />

volume<br />

3.00 ft/sec. C (32) D (39) E (55) F (114) F (161)<br />

3.50 ft/sec. C (33) D (38) E (68) F (99) F (146)<br />

4.00 ft/sec. C (32) E (55) E (72) E (76) F (83)<br />

Major street LOS (and average delay, in sec.)<br />

3.00 ft/sec. D (37) D (47) E (71) F (156) F (219)<br />

3.50 ft/sec. C (35) D (40) D (52) F (102) F (169)<br />

4.00 ft/sec. C (31) C (33) D (37) D (38) D (43)<br />

Minor street LOS (and average delay, in sec.)<br />

3.00 ft/sec. C (24) C (25) C (30) D (46) E (68)<br />

3.50 ft/sec. C (30) C (35) F (93) F (95) F (109)<br />

4.00 ft/sec. D (35) F (91) F (129) F (138 F (147)<br />

There were different environments between the two intersections with traditional signals and the two<br />

intersections with countdown signals, which may account <strong>for</strong> the differences in observed pedestrian<br />

activity. With this caveat, the key results are as follows <strong>for</strong> Orange County:<br />

• MWS <strong>for</strong> younger pedestrians was 4.80 ft./sec. at the two TPS and 5.30 ft./sec. at the two<br />

countdown signals. This difference was statistically significant.<br />

• MWS <strong>for</strong> older pedestrians was 4.20 ft./sec. at the two TPS and 4.80 ft./sec. at the two<br />

countdown signals. This difference was statistically significant.<br />

• MWS <strong>for</strong> older pedestrians was generally slower than <strong>for</strong> pedestrians under 65 by about 0.60<br />

ft./sec. The difference in walking speeds between the two age groups was significant at both<br />

countdown signals and traditional signals.<br />

• <strong>Pedestrian</strong>s with mobility impairments and without motorized wheelchairs had appreciably<br />

slower walking speeds—their mean was 3.00 ft./sec. compared to about 4.20 ft./sec. <strong>for</strong> older<br />

pedestrians and 4.80 ft./sec. <strong>for</strong> younger pedestrians. A small sample size is recognized.<br />

• Older pedestrians had a slower start-up time, but this will vary by intersection and leg of<br />

intersection.<br />

• A higher level of compliance (entering crosswalk on WALK display) was found with the TPS<br />

with both age groups.<br />

225

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