Incorporating Safety Performance into Project Design Decision-Making for Cost Effective Safety Enhancements

Rigid conformity to existing policies, standards and guidelines, does not guarantee safety for the traveling public utilizing the state highway system. Arizona Department of Transportation (ADOT) standards for a highway posted at 65 mph indicate a clear zone distance of 30 feet from the edge of the travel lane on level terrain with 6:1 side slopes. Typically the right of way line may be found 30 feet or more past the clear zone boundary. Within the area found between the clear zone boundary and the right of way line, a myriad of hazardous fixed objects (trees, rocks, poles, electrical boxes, etc.) are frequently struck by errant vehicles that run off the pavement edge. Preliminary Traffic HES study results indicate that a majority of Run-Off-Road accidents occur at a distance of well over 30 feet from the pavement edge. As a result, it appears that wider clear zones need to be accommodated into the expansion of the clear zone distances that ADOT uses. In addition, there may be other standards, guidelines and "rules-of-thumb" that ADOT currently uses, which need some additional evaluation as well. Under this project, each of the existing policies, standards, and guidelines that ADOT currently uses during project development will be researched to determine whether any low-cost safety enhancements could be incorporated into any existing standards, guidelines, procedures, or policies.


    • English


    • Status: Completed
    • Funding: $150000.00
    • Contract Numbers:


    • Sponsor Organizations:

      Federal Highway Administration

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

      Arizona Department of Transportation

      206 South 17th Avenue
      Phoenix, AZ  United States  85007
    • Project Managers:

      Kar, Kohinoor

    • Performing Organizations:

      Cambridge Systematics

      555 12th Street
      Suite 1600
      Oakland, CA  United States  94607
    • Principal Investigators:

      Wemple, Beth

    • Start Date: 20071024
    • Expected Completion Date: 0
    • Actual Completion Date: 20160229
    • Source Data: RiP Project 14988

    Subject/Index Terms

    Filing Info

    • Accession Number: 01566112
    • Record Type: Research project
    • Source Agency: Arizona Department of Transportation
    • Contract Numbers: 651
    • Files: RiP, STATEDOT
    • Created Date: Jun 10 2015 1:01AM