Adaptive Signal System Safety Impacts

Adaptive signal systems continuously change traffic signal timings to meet current traffic volume demands, as opposed to a typical coordinated signal system where timings are set to be the same each day based on historical traffic patterns. SCDOT has recently added several adaptive signal systems throughout the state, with more planned in the near future. Currently, it is unknown the extent of how adaptive signal systems are able to improve safety along corridors as compared to typical “time of day” signal coordination. Theoretically, signal systems better coordinated to traffic patterns will reduce vehicle stops and congestion, and therefore reduce rear-end collisions and collisions as a whole. The objective of the research is to determine the reduction in crashes due to the installation of the adaptive signal system. Before and after data will be collected on the corridors to include number and type of crashes, vehicular volume, and travel time (congestion) data. For corridors that are parallel routes to interstates, further analysis for those sections of interstate and the reduction in secondary crashes due to traffic being more efficiently routed through parallel adaptive corridors.


  • English


  • Status: Active
  • Contract Numbers:

    SPR 737

  • Sponsor Organizations:

    South Carolina Department of Transportation

    955 Park Street
    P.O. Box 191
    Columbia, SC  United States  29202-0191

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Performing Organizations:

    Clemson University

    110 Lowry Hall
    Box 340911
    Clemson, SC  United States  29634-0911
  • Principal Investigators:

    Chowdhury, Mashrur

  • Start Date: 20171101
  • Expected Completion Date: 20200331
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01661885
  • Record Type: Research project
  • Source Agency: South Carolina Department of Transportation
  • Contract Numbers: SPR 737
  • Files: RiP, STATEDOT
  • Created Date: Mar 6 2018 11:37AM