Highway Safety Manual Part D: Validation and Application in Wyoming

Transportation Engineering is a relatively old branch of engineering whose importance has been stressed by the engineering community for some period of time. Traffic safety, however, is relatively a new field and its emphasis has been growing since epidemic nature of roadway fatalities has been discovered in the last decade. American Association of State Highway and Transportation Officials (AASHTO), after ten years of research have finally published their first edition of Highway Safety Manual (HSM) in 2010.The Highway Safety Manual (HSM) is a result of extensive work spearheaded by the Transportation Research Board (TRB) committee on Highway Safety Performance. This is a well-received development as it bridges the gap between research and practice. The HSM is considered as the sole national resource for quantitative information about traffic accident analysis and evaluation with a main focus of reducing crash frequency and severity. Equally useful is the Federal Highway Administration (FHWA) Guide to Developing Quality Crash Modification Factors (CMFs). Crash Modification Factors or Functions are defined as a quantitative measure of the safety effectiveness of a particular treatment or design element. The HSM includes CMFs for treatments applied to five different categories; 1) roadway segments (e.g., alignment, roadside elements, rumble strips, etc.) 2) intersections (e.g., geometry, and control), 3) interchanges, 4) special facilities (e.g., highway-rail crossing), and 5) road networks. It is worth mentioning that the CMFs provided in the HSM were calibrated using data from various states with different driver population, traffic laws, crash reporting thresholds, and weather and roadway conditions. Thus, a validation of the applicability of the HSM Part-D in Wyoming is essential. This research proposal is a first step toward the adaptation of the Highway Safety Manual to Wyoming conditions. The HSM has been a hot research topic since its publication. Researchers are keen to work on the application of the HSM in different states. States like Florida (Ahmed et al., 2015; Ahmed and Abdel-Aty, 2015; Abdel-Aty et al., 2014), Utah (Brimley et al., 2012), Kansas (Howard and Steven, 2012), Oregon (Zhou and Dixon, 2012) and etc., have already worked on calibrations and modifications of the Crash Modification Factors in the HSM on their own roadways. Although other states have calibrated their own CMFs, it was clearly found that the HSM in its current format will not be suitable to adopt in Wyoming.


  • English


  • Status: Completed
  • Funding: $110098
  • Contract Numbers:


  • Sponsor Organizations:

    Research and Innovative Technology Administration

    University Transportation Centers Program
    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Mountain-Plains Consortium

    North Dakota State University
    P.O. Box 6050, Department 2880
    Fargo, ND  United States  58108-6050
  • Project Managers:

    Kline, Robin

  • Performing Organizations:

    University of Wyoming

    Dept. of Civil and Architectural Engineering
    1000 E. University Avenue
    Laramie, WY  United States  82071
  • Principal Investigators:

    Ahmed, Mohamed

  • Start Date: 20150509
  • Expected Completion Date: 20190930
  • Actual Completion Date: 20190612
  • USDOT Program: University Transportation Centers Program
  • Source Data: MPC-474

Subject/Index Terms

Filing Info

  • Accession Number: 01579591
  • Record Type: Research project
  • Source Agency: Mountain-Plains Consortium
  • Contract Numbers: DTRT13-G-UTC38
  • Files: UTC, RiP
  • Created Date: Oct 23 2015 2:01PM