ACCIDENTS BEFORE AND AFTER THE 65 MPH SPEED LIMIT IN CALIFORNIA. FINAL REPORT (SUPPLEMENTAL REPORT)

This report examines the impact of the 65 mph speed limit on traffic accident rates on rural interstate and noninterstate highways posted at 65 mph, and on the rural interstate highways retained at 55 mph. The statistical method used contrasts the 65 mph roads with the 55 mph roads regarding "summary" and "detailed" accident data. This was done to isolate from extraneous factors the impact of speed limit change on accident rates. The results show that rural interstate segments retained at 55 mph have lower accident rates compared to 65 mph roads. The differences in some types of accident rates, between the 65 mph and the 55 mph roads, are statistically significant. A discussion of the accident monitoring program for the entire state highway system, and the 65 mph segments in particular, is presented.

  • Supplemental Notes:
    • See also TRIS 625381.
  • Corporate Authors:

    California Department of Transportation

    Division of Traffic Operations, 1120 N Street
    Sacramento, CA  United States  95814
  • Authors:
    • Khorashadi, A
  • Publication Date: 1994-6

Language

  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 74 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00664329
  • Record Type: Publication
  • Report/Paper Numbers: CA-TO-94-1, Rept No. 51-358-908074
  • Files: TRIS, STATEDOT
  • Created Date: Aug 17 1994 12:00AM