This report examines the development of two roadside barrier-median barrier systems by computer simulation. The systems are designated as the Concrete Barrier with Blockedout W Rail and the Thrie T Barrier (TTB). Both systems are designed for impacts by vehicles ranging from 2250 lb (1020 kgm) to 40,000 lb (18.140 kgm). In addition, the concrete barrier with a blockedout W rail was investigated for impacts by vehicles in the 1650 lb (750 kgm) category. Both barriers are sufficiently developed for full-scale testing. The concrete barrier with a blocked out W rail was designed as a rail attached to a vertical wall blocked out with a reusable unit which acts as a one-way spring. The rail was also designed to be attached to a safety shape. The simulation results indicate that the rollover probability of a lightweight narrow wheelbase vehicle impacting a safety shape with a blockedout W rail is significantly reduced when compared to impacts of the some vehicle with a plain safety shape. The TTB was developed by strengthening the European Neher-SWOV barrier. The TTB is a multiple stage barrier utilizing two thrie beam ribbons rigidly separated by a spacer and attached to a post to form a T. Both barriers appear to be capable of redirecting lightweight vehicle impacts at an intensity reduced from existing systems, and both systems appear to be capable of retaining intercity buses. (FHWA)

  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011

    Federal Highway Administration

    Office of Research, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Marquis, E L
    • Hirsch, T J
  • Publication Date: 1978-9

Media Info

  • Pagination: 108 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00315055
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FHWA-RD-79- 65 Final Rpt., FCP 31T3-012
  • Contract Numbers: DOT-FH-11-8796
  • Files: TRIS, USDOT
  • Created Date: Aug 5 1980 12:00AM