Pedestrian Signal Safety - AAA Foundation for Traffic Safety
Pedestrian Signal Safety - AAA Foundation for Traffic Safety
Pedestrian Signal Safety - AAA Foundation for Traffic Safety
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For younger pedestrians, the mean walking speed (MWS) was 4.80 feet/second (ft./sec.) at traditional<br />
intersections and 5.30 ft./sec. at intersections equipped with countdown signals. The 15th-percentile<br />
walking speed represents the slower pedestrians at the intersection. The 15th-percentile speed was<br />
4.10 ft./sec. at traditional signals and 4.70 ft./sec. at PCD signals. A walking speed of 4.00 ft./sec.<br />
would accommodate the 15th-percentile younger pedestrian at any of these four intersections.<br />
For older pedestrians, MWS was 4.20 ft./sec. at traditional intersections and 4.80 ft./sec. at<br />
intersections equipped with countdown signals. The 15th-percentile speed was 3.60 ft./sec.<br />
at traditional signals and 4.00 ft./sec. at PCD signals. A walking speed of 4.00 ft./sec. would<br />
accommodate the 15th-percentile older pedestrian at the PCD intersection but not at the traditional<br />
intersection.<br />
The significance testing <strong>for</strong> MWS is presented in Table H-3. There was a significant difference in<br />
MWS at traditional and PCD intersections <strong>for</strong> both younger and older pedestrians.<br />
Table H-3. Significance testing of difference in mean walking speed at traditional and pedestrian<br />
countdown signals <strong>for</strong> two age groups.<br />
Subjects<br />
<strong>Pedestrian</strong>s<br />
under 65<br />
<strong>Pedestrian</strong>s<br />
65 and older<br />
Intersection<br />
type<br />
Mean Standard<br />
deviation Tcalc Outcome<br />
Traditional 4.8 0.73<br />
Countdown 5.3 0.73<br />
9.66<br />
Traditional 4.2 0.71 6.84<br />
The difference<br />
between means is<br />
significant at 95<br />
percent.<br />
The difference<br />
between means is<br />
significant at 95<br />
percent.<br />
Table H-4 presents the results of significance testing of the difference in MWS <strong>for</strong> younger<br />
pedestrians and older pedestrians. As would be expected, the walking speed <strong>for</strong> older pedestrians<br />
was significantly slower than the walking speed <strong>for</strong> younger pedestrians, regardless of the type of<br />
pedestrian signal.<br />
Table H-4. Significance testing of difference in mean walking speed <strong>for</strong> younger pedestrians and<br />
older pedestrians <strong>for</strong> two types of pedestrian signal.<br />
Intersection<br />
type<br />
Traditional<br />
Countdown<br />
Subjects Mean Standard<br />
deviation Tcalc Outcome<br />
<strong>Pedestrian</strong>s<br />
under 65<br />
<strong>Pedestrian</strong>s<br />
65 and older<br />
4.8<br />
4.2<br />
0.73<br />
0.71<br />
7.83<br />
The difference<br />
between means is<br />
significant at 95<br />
percent.<br />
<strong>Pedestrian</strong>s<br />
under 65<br />
<strong>Pedestrian</strong>s<br />
65 and older<br />
5.3<br />
4.8<br />
0.73<br />
0.81<br />
6.43<br />
The difference<br />
between means is<br />
significant at 95<br />
percent.<br />
215