Evaluation of NDOR's actuated advance warning systems.
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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
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Evaluation of NDOR's actuated advance warning systems.

Filetype[PDF-1.55 MB]


English
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Details:

  • Creators:
  • Corporate Creators:
    Nebraska Transportation Center
  • Corporate Contributors:
    Nebraska. Dept. of Roads
  • Subject/TRT Terms:
  • 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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