Development of Crash Modification Factors for Speed Management of Traffic Signal Progression [Summary]

Details

• Creators:
  Lin, Pei-Sung ; El-Urfali, Alan
• Corporate Creators:
  University of South Florida. Center for Urban Transportation Research
• Corporate Contributors:
  Florida Department of Transportation
• Subject/TRT Terms:
  Best Practices Cameras Crash Modification Factors Cyclists Guidelines Pedestrian Safety Speed Control Traffic Signal Timing
• Resource Type:
  Brief
• Geographical Coverage:
  Florida ; United States
• Edition:
  Research Brief
• Corporate Publisher:
  Florida Department of Transportation
• Abstract:
  This research project investigated the impacts of traffic signal progression strategy on the safety of pedestrians and bicyclists. The CUTR team used historical (crash, traffic, and roadway) data, cross-sectional study designs, and random parameter negative binomial models to estimate the effects of signal progression design on pedestrian and bicycle crash frequency and severity. Crash modification factors (CMFs) were developed to assess the safety effects of three countermeasures: (1) progression speed, (2) progression speed management, and (3) progression quality (smooth traffic flow). The study findings show the pronounced impacts of well-designed progression speed management with good progression quality on reducing the frequency and severity of pedestrian and bicycle crashes. Improving poor progression speed management to good-to-great progression speed management can reduce pedestrian and bicycle crash frequency by 55% and severe pedestrian and bicycle crash frequency by 75%. Improving poor progression quality to good progression quality from signal retiming can decrease pedestrian and bicycle crash frequency by 52% and severe pedestrian and bicycle crash frequency by 72%. With traffic signal retiming to increase progression speed and improve speed management and progression quality, both driver mobility and pedestrian and bicycle safety can be achieved simultaneously.
• Format:
  PDF
• Funding:
  BDV25-977-73
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f33f5d5344924e68c4deec4d0787352119458f6721218dbc4d3d69e5d80f4016109a2d81b04f8dde4d341c937dfabd2d1916094ab6a69e18a8528180968263b4
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/75385/dot_75385_DS1.pdf
• File Type:
  [PDF - 316.24 KB ]