The effects of pedestrian countdown timers on safety and efficiency of operations at signalized intersections.

Details

• Creators:
  Sharma, Anuj ; Schmitz, Jacob
• Corporate Creators:
  Nebraska Transportation Center
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Automobile Drivers Before And After Studies Data Collection Drivers Traffic Signs And Signals Pedestrian Clearance Interval (Traffic Signals) Pedestrian Crosswalks Pedestrians--Safety Measures Pedestrian Traffic Signalized Intersections Timers Traffic Safety

  More +
• 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:sha-512:5d199fdb28d2a90a4c705ce2478e74ffdbd36d978c762dc8c4d55f75dd04f1c1836f4c242861e67b27a752e571e0b7cf7a8d51ebfdf94ac1a78ffb0088257fee
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25907/dot_25907_DS1.pdf
• File Type:
  [PDF - 10.01 MB ]