Evaluation of Mitigation for Safety Concerns on Low-Volume, Unpaved Rural Roads

The Institute for Transportation (InTrans) at Iowa State University completed work on an in-depth study of crash history on low-volume, rural roads in Iowa in December 2010. Results indicated that unpaved roads with traffic volumes greater than 100 vehicles per day (vpd) exhibit significantly higher crash frequencies, rates, and densities than any other class of low-volume road examined, paved or unpaved. The total mileage for this class of roadway in Iowa is only about 4,400 miles, spread over 99 counties in the state, which is certainly a manageable number of miles for individual rural agencies. The purpose of this study was to identify and examine several unpaved, local road segments with higher than average crash frequencies, select and undertake potentially-beneficial mitigation, and evaluate the results as time allowed. A variety of low-cost options were considered, including engineering improvements, enhanced efforts by law enforcement, and educational initiatives. Using input, active support, and participation from local agencies and state and Federal safety advocates, the study afforded a unique opportunity to examine useful tools for local rural agencies to utilize in addressing safety on this particular type of roadway.

  • Record URL:
  • Corporate Authors:

    Iowa State University, Ames

    2711 South Loop Drive
    Suite 4700
    Ames, IA  United States  50010-8664

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010

    Federal Highway Administration

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

    Midwest Transportation Consortium

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

    Research and Innovative Technology Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • McDonald, Tom
    • Sperry, Robert
  • Publication Date: 2013-5


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Bibliography; Figures; Photos; References; Tables;
  • Pagination: 79p

Subject/Index Terms

Filing Info

  • Accession Number: 01485852
  • Record Type: Publication
  • Report/Paper Numbers: InTrans Project 10-391
  • Created Date: Jul 2 2013 1:07PM