Calibrating Crash Modification Factors for Wyoming: Specific Conditions, Application of Highway Safety Manual - Part D

In this study, the Empirical Bayes (EB) approach to analysis before-after effects will be utilized. The EB method can overcome the limitations faced by simple before-after evaluation and compare group methods by not only accounting for regression to the mean effects, but also accounting for traffic volume changes when identifying the crash modification factors. This will increase the reliability for the Crash Modification Factors (CMF) and increase the likelihood of achieving the same change in crash frequency if the treatment is implemented elsewhere.


  • English


  • Status: Completed
  • Contract Numbers:


  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    Wyoming Department of Transportation

    5300 Bishop Boulevard
    Cheyenne, WY  United States  82009-3340
  • Managing Organizations:

    Wyoming Department of Transportation

    5300 Bishop Blvd.
    Cheyenne, WY  United States  82009-3340
  • Project Managers:

    Carlson, Matt

  • Performing Organizations:

    University of Wyoming, Laramie

    1000 E University Avenue, Department 3295
    Laramie, WY  United States  82071
  • Principal Investigators:

    Ahmed, Mohamed

  • Start Date: 20160122
  • Expected Completion Date: 20170131
  • Actual Completion Date: 0
  • USDOT Program: Transportation, Planning, Research, and Development
  • Subprogram: Research

Subject/Index Terms

Filing Info

  • Accession Number: 01587410
  • Record Type: Research project
  • Source Agency: Wyoming Department of Transportation
  • Contract Numbers: RS03216
  • Files: RiP, STATEDOT
  • Created Date: Jan 25 2016 12:58PM