Evaluation of NDOR's actuated advance warning systems.

Details

• Creators:
  Appiah, Justice ; Wu, Zifeng ; Rilett, Laurence R.
• Corporate Creators:
  Nebraska Transportation Center
• Corporate Contributors:
  Nebraska. Dept. of Roads
• Subject/TRT Terms:
  • Dilemma zone
  • Advanced driver information systems
  • Driver support systems
  • Automated highway systems
  • Traffic safety
• Publication/ Report Number:
  NTC report TSPT1-03
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Corporate Publisher:
  Nebraska Transportation Center
• Abstract:
  "Driver behavior within the dilemma zone can be a major safety concern at high-speed signalized intersections. The ; Nebraska Department of Roads (NDOR) has developed and implemented an actuated advance warning (AAW) dilemma ; zone protection system. Although these systems have received positive reviews from the public—and commercial vehicle ; operators in particular—there has been no comprehensive analysis of their effects on safety and traffic operations. The ; focus of this research was to conduct a quantitative study to ascertain the efficacy of the NDOR advance warning system. ; First, crash records from before and after the implementation of the system at 26 intersections were compared. In addition, ; 29 control intersections were used to compare crash rates over time, and a fully Bayesian technique was employed to ; ensure that no exogenous variables affected the study. Results of the safety analysis were promising (a 43.6% reduction in ; right-angle crashes) and suggested that the use of the system should be encouraged as an effective safety treatment for the ; dilemma zone problem at high-speed signalized intersections. Second, a non-intrusive data collection system was used to ; monitor traffic and to collect a continuous stream of data up to 1,000 ft upstream of the stop line at two high-speed ; signalized intersections equipped with the system. The results suggested that the system was effective at alerting drivers to ; the impending end of the green signal: approximately 78% of drivers observed in this study either maintained their speeds ; or slowed down when the signs began to flash. It was also found that the number of vehicles in their dilemma zones when ; the signal indication changed from green to amber was 77.2% smaller than the number that would have been expected if ; the NDOR AAW system had not been installed. Finally, a modeling framework was developed that could be used to ; perform consistent, detailed analyses of these systems. Results from two demonstration studies indicated that the proposed ; procedure had potential for studying these systems in a microsimulation environment."
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25286/dot_25286_DS1.pdf
• File Type:
  [PDF - 1.55 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:bd1ae1a9bb028f9e89cf7250f7377d18cfb46edc68f300260b1b1c67f6a7b89f8211eb1cf473105cfa63a7641272a0615a204c8304ef40f8ab711fb6ba9ba7e8