Determine Adequacy of Installation of Existing Roadside Barriers on High-Speed Roadways

The American Association of State Highway and Transportation Official (AASHTO) Manual for Assessing Safety Hardware (MASH) specifies the highest impact speed for crash testing of barrier systems with passenger vehicles is 62 mph, which was derived from analyses of reconstructed crash data nearly 20 years old. Preliminary data from National Cooperative Highway Research Program (NCHRP) Project 17-43, Long-Term Roadside Crash Data Collection Program under which a new database of reconstructed run-off-road crashes is being developed, indicates that for highways with a posted speed limit greater than 70 mph, the 85th percentile impact speed is 67.7 mph. This represents a need for a higher design impact speed for barriers used on these higher speed roadways. Increased impact speeds will place more demand on barrier systems. There have been observations of guardrail systems developing partial rail tears when tested under MASH impact conditions, indicating that these systems are near their containment capacity. The Receiving Agency has a significant mileage of roadways with posted speeds of 75 miles per hour (mph) and greater. The Performing Agency shall assess performance limits of identified commonly used barrier systems for higher impact speeds using engineering analysis and finite element (FE) simulations and provide with design guidance for selection and installation of such barriers at higher posted speed limit highways, while maintaining MASH compliance.


  • English


  • Status: Completed
  • Funding: $269998
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Managing Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Jensen, Darrin

  • Performing Organizations:

    Texas A&M Transportation Institute

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135
  • Principal Investigators:

    Bligh, Roger

  • Start Date: 20210901
  • Expected Completion Date: 20230831
  • Actual Completion Date: 20230831

Subject/Index Terms

Filing Info

  • Accession Number: 01782718
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7121
  • Files: RIP, STATEDOT
  • Created Date: Sep 23 2021 12:26PM