countdown pedestrian signals presentation by jack fleck, city/county of san francisco february 28,...
TRANSCRIPT
Countdown Pedestrian SignalsPresentation by Jack Fleck, City/County of San Francisco
February 28, 2006
Countdown Questions
• Will cars speed up to make the light?• Will more pedestrians start to cross on the
Flashing Red Hand?• Is it better to start the countdown on the
Flashing Red Hand or on the Walk symbol?
• Will pedestrians be able to judge how much time it takes them to cross?
• Will the intersections be safer?
Pilot Project--2001
Countdown signals initially installed at 14 test locations, 9 assessed.
City eventually replaced pedestrian signals with Countdown Signals (over 700 intersections).
More energy-efficient, so electricity savings will eventually pay for LED device installation
Pilot Countdown Locations vs. Control Locations
0%
20%
40%
60%
80%
100%
120%
Countdow n-Equipped
Intersections
Planned CDSIntersections
No CDS-PlannedIntersections
Planned CDSIntersections -
Higher Ped. CrashesPre-Installation
Note: Countdow n reduction statistically significant, p<0.05
Co
llis
ion
s a
s %
of
Pre
-In
sta
lla
tio
n L
ev
el
Pre-InstallationPost-Installation
27
13
764 740 469
423
507
282
Additional Pilot Study Results
34%
13%14%
76%
8%9%
0%
10%
20%
30%
40%
50%
60%
70%
80%
Finish Crossing on Red Run or Abort Crossing Rating of Ped Signal as "VeryHelpful"
Note: All differences statistically significant, p<0.01
% o
f Ped
estr
ians
Pre-InstallationPost-Installation
Citywide Countdown Results:Pedestrian Related Collisions
2001 2002 2003 2004
With pedestrian signals (579 sites)
186 193 159 142
Without pedestrian signals (204 sites)
43 52 44 56
Citywide reported total
832 844 771 683
Before After Change % Change
With pedestrian signals (579 sites)
190 142 -48 -25%
Without pedestrian signals (204 sites)
48 56 8 16%
Countdown Signals:Impact on Vehicle Collisions
2001 2002 2003 2004
With pedestrian signals (579 sites)
498 471 383 320
Without pedestrian signals (204 sites)
168 213 180 163
Citywide reported total1697 1796 1538 1315
Before After Change % Change
With pedestrian signals (579 sites)
485 320 -165 -34%
Without pedestrian signals (204 sites)
191 163 -28 -15%