Evaluation of Rural Intersection Treatments

Because crashes at rural intersections frequently result from failure to yield, agencies attempt to find countermeasures that encourage drivers to stop and yield appropriately. In this research, two promising low-cost rural intersection countermeasures were selected and evaluated for their impact on safety: post-mounted beacons and retroreflective strips on stop sign posts. The post-mounted beacons were set to activate only when an approaching vehicle’s speed surpassed a predetermined threshold. High-crash rural stop-controlled intersections were identified using in-house crash and roadway data and then filtered for suitability via site visits. The retroreflective strips were installed on stop signs at 14 intersections on both minor street approaches. The post-mounted beacons were installed on stop signs at 10 approaches at 6 intersections. Driver behavior was used to assess the countermeasures. Because the post-mounted beacon was expected to noticeably impact driver behavior while the retroreflective strips were not, driver behavior data were only collected at locations where post-mounted beacons were installed. Video data were collected using trailer-mounted camerasat all 10 approaches where post-mounted beacons were installed 1 month before and 1 month after installation. For 6 of the 10 approaches, data were also collected 12 months after installation. Several driver behavior metrics, including type of stop, stopping position, braking point, and number of times braking, were reduced for a random sample of vehicles for each approach in each evaluation period and were compared before and after installation. Overall, the post-mounted beacon had an overwhelmingly positive safety benefit, as measured by several changes in driver behavior. Most approaches where the countermeasure was installed experienced increases in the number of drivers making full stops, braking within 450 to 500 ft of the intersection, stopping at or before the stop bar, and braking only once. Ideally, these improvements in driver behavior will result in reduced crashes at the study intersections. Because the retroreflective strips were not evaluated, the researchers propose to conduct a crash analysis when at least three years have elapsed after installation.

Language

  • English

Project

  • Status: Completed
  • Funding: $130000
  • Contract Numbers:

    Addendum 549

    TR-695

    ISU Proposal 132038

    DTRT13-G-UTC37

  • Sponsor Organizations:

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010

    Midwest Transportation Center

    Iowa State University
    2711 S Loop Drive, Suite 4700
    Ames, IA  United States  50010-8664

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590

    Iowa Highway Research Board

    Iowa Department of Transportation
    800 Lincoln Way
    Ames, IA  United States  50010
  • Managing Organizations:

    Iowa State University, Ames

    Center for Transportation Research and Education
    2711 South Loop Drive, Suite 4700
    Ames, IA  United States  50010-8664

    Midwest Transportation Center

    Iowa State University
    2711 S Loop Drive, Suite 4700
    Ames, IA  United States  50010-8664
  • Project Managers:

    Goetz, Vanessa

  • Performing Organizations:

    Iowa State University, Ames

    Center for Transportation Research and Education
    2711 South Loop Drive, Suite 4700
    Ames, IA  United States  50010-8664
  • Principal Investigators:

    Hallmark, Shauna

  • Start Date: 20150701
  • Expected Completion Date: 20180531
  • Actual Completion Date: 20180601

Subject/Index Terms

Filing Info

  • Accession Number: 01658629
  • Record Type: Research project
  • Source Agency: Iowa Department of Transportation
  • Contract Numbers: Addendum 549, TR-695, ISU Proposal 132038, DTRT13-G-UTC37
  • Files: UTC, RiP, STATEDOT
  • Created Date: Jan 31 2018 12:25PM