Details:

Creators:
Sharma, Anuj ; Schmitz, Jacob
Sharma, Anuj ; Schmitz, Jacob Less -
Corporate Creators:
Nebraska Transportation Center
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Automobile Drivers Before And After Studies Data Collection Drivers Pedestrian Clearance Interval (Traffic Signals) Pedestrian Crosswalks Pedestrians--Safety Measures Pedestrian Traffic Signalized Intersections Timers Traffic Safety Traffic Signs And Signals
Publication/ Report Number:
SPR-P1 (09) P332
Resource Type:
Tech Report
Geographical Coverage:
Nebraska
Corporate Publisher:
Nebraska. Dept. of Roads
Abstract:
Pedestrian countdown timers are becoming common at urban and suburban intersections. The added information that

pedestrian countdown timers provide to pedestrians can also be used by approaching drivers. A before-and-after case study

on the effects that pedestrian countdown timers have on safety and efficiency of operations was performed at two

signalized intersections in Lincoln, Nebraska. The effects on both drivers and pedestrians were analyzed. Performance

measures for pedestrian analysis include pedestrian compliance and average pedestrian walking speed. Performance

measures for the driver analysis include probability of stopping and speed gain of vehicles at the stop bar during the yellow

phase (vehicles passing through the intersection during the yellow phase) and queue discharge headway. Data was

collected using a Wide Area Detector (WAD), point detector at the stop bar and a Pan-Tilt-Zoom (PTZ) video camera.

Data was collected using state-of-the-art data collection software, Wonderware, which displayed all traffic and pedestrian

signal information, vehicle detections, individual vehicle speeds, vehicle distances from stop bar, and the video from the

PTZ camera all on one computer screen. Statistical models were estimated to understand the effects that pedestrian

countdown timers have on the performance measures. The resulting models identified statistically significant factors that

affected the performance measures. Pedestrian countdown timers were found to increase pedestrian walking speed by 0.2

ft/sec, and decrease the probability of pedestrian violations. Impact of PCT on driver safety and efficiency was not found to

be statistically significant at 95% level of confidence. There was however some evidence, although not statistically

significant of improvement of driver safety due the presence of PCT. The trend was more pronounced at the intersection of

17th and G (smaller intersection with less visual clutter) where we observed reduction in the percentage of red light runners

and some reduction of dilemma zone boundaries.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:62d7cf5a5bf92687759dc0697583373519ee2f0312a1d70c808fed1f6960905f
Download URL:
https://rosap.ntl.bts.gov/view/dot/25907/dot_25907_DS1.pdf
File Type:

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