Updating and Implementing the Grade Severity Rating System (GSRS) for Wyoming Mountain Passes

The proposed study is aimed at achieving two main goals. First, the Federal Highway Administration's (FHWA's) grade severity rating system (GSRS) model will be updated to reflect the current truck population characteristics. This will be achieved by carrying out field tests with an instrumented vehicle to update parameters in the model that reflect current truck characteristics and braking systems. The second objective of the study is to evaluate Wyoming mountain passes and their warning systems with regard to truck downgrade crashes. By doing this, the best means of communicating with truck drivers to reduce the probability of runaway truck incidences can be recommended. By achieving the two goals, the study will present recommendations that will counter the occurrence and severity of downgrade truck crashes on Wyoming mountain passes. A new software will be developed for estimating maximum safe speeds for truck weight categories using the new parameters. The estimates from the new software will be more consistent with current truck characteristics and a combination of these estimates with an effective warning system will encourage compliance by truck drivers.


  • English


  • Status: Active
  • Contract Numbers:



  • Sponsor Organizations:

    Federal Highway Administration

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

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    Wyoming Department of Transportation

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

    Evensen, James

    Meena, Joel

    Carlson, Matt

    Kline, Robin

  • Performing Organizations:

    University of Wyoming, Laramie

    1000 E University Avenue, Department 3295
    Laramie, WY  United States  82071

    Mountain-Plains Consortium

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

    Wyoming Department of Transportation

    5300 Bishop Blvd.
    Cheyenne, WY  United States  82009-3340
  • Principal Investigators:

    Ksaibati, Khaled

    Apronti, Dick

  • Start Date: 20171102
  • Expected Completion Date: 20220731
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01607474
  • Record Type: Research project
  • Source Agency: Wyoming Department of Transportation
  • Contract Numbers: RS08216, 69A3551747108
  • Files: UTC, RiP, STATEDOT
  • Created Date: Aug 8 2016 4:58PM