To gain information on the performance of W-beam steel guardrail in accidents, investigating officers filed a supplemental form for each vehicle/guardrail accident on the Michigan State Highway system over a six-month period. Correlation analysis was conducted on the data so obtained for 1,375 single-vehicle/guardrail accidents. The injury rate (proportion of accidents resulting in personal injury) was higher for 12.5 ft (3.81 m) post spacing than for 6.25 ft (1.90 m) spacing. The injury rate was lower for the vehicles that were redirected rather than vaulting or breaking through the guardrail. Approach endings with a flared end shoe had a higher injury rate then did buried end-sections. There was no significant difference in injury rates between approach-end and mid-rail impacts.

  • Corporate Authors:

    Michigan Department of State Highways & Transport

    State Highways Building, P.O. Drawer K
    Lansing, MI  United States  48904
  • Authors:
    • Lampela, A A
    • Yang, A H
  • Publication Date: 1974-7

Media Info

  • Features: Figures; Tables;
  • Pagination: 54 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00096913
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Report/Paper Numbers: TSD-243-74, HS-016 908
  • Created Date: Sep 30 1989 12:00AM