Rural Bridge Safety: Evaluation of Atypically Large Farm Vehicles

The Pacific Northwest region has no data on the assessment and recommendations on rural bridge design and safety subjected to Farm Vehicle (FV) loading. The proposed study will determine how different types of FVs with different characteristics distribute their loads on bridge superstructures. These will be realized through actual load testing, computer simulation, and statistical analysis. At least two bridges, one in Idaho (ID) and one in Oregon (OR), will be physically tested, subject to a variety of FVs. The structural behavior of the bridges will be monitored using wireless sensors to assess the behavior of bridges’ superstructures and the corresponding load distribution factors for girders under the critical loading conditions will be determined. The selected bridges will be representative of rural bridges problematic for FV traffic in the region. The field investigation of the proposed bridges will be used to validate computer models in order to explore a broad number of bridges under various FVs. The research team will develop a FV profile that represents worst-case scenarios for use in determining load limits and distribution factors which will lead to increased infrastructure and operators’ safety. With the information developed, unique traffic sign designs, that will include variations of tractor symbols and weight limits, will be developed and evaluated through an online comprehension survey of FV operators. The survey results inform supplemental traffic signage to be added to rural bridges to increase infrastructure and operator’s safety.


  • English


  • Status: Completed
  • Funding: $45000
  • Contract Numbers:


  • Sponsor Organizations:

    Pacific Northwest Transportation Consortium

    University of Washington
    More Hall Room 112
    Seattle, WA  United States  98195-2700

    Office of the Assistant Secretary for Research and Technology

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

    University of Idaho, Moscow

    Department of Civil Engineering
    P.O. Box 441022
    Moscow, ID  United States  83844-1022
  • Project Managers:

    Ibrahim, Ahmed

  • Performing Organizations:

    University of Idaho, Moscow

    Department of Civil Engineering
    P.O. Box 441022
    Moscow, ID  United States  83844-1022
  • Principal Investigators:

    Ibrahim, Ahmed

  • Start Date: 20161215
  • Expected Completion Date: 20180131
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers
  • Subprogram: Bridge Safety
  • Source Data:

Subject/Index Terms

Filing Info

  • Accession Number: 01632768
  • Record Type: Research project
  • Source Agency: Pacific Northwest Transportation Consortium
  • Contract Numbers: DTRT13-G-UTC40
  • Files: UTC, RiP
  • Created Date: Apr 27 2017 3:52PM