The report constitutes a major review of median barrier policies and procedures at Caltrans. It attempts to assemble all of the important documentation into one source that can be used as a handy reference. The report also reviews data from recent years to see if any cahnges need to be made in current practices. The report also is the latest in the continuiing study of median barriers. New data were developed on cross-median accident rates in wide medians, on accident rates involving median barriers, on median barrier penetrations , on the relative accident severity of concrete and three beam barriers, on rebound accidents, and the "before-and-after" accident records with median barrier installation. Generally, these data did not suggest any major revisions in median barrier policies, practices or procedures. The traffic volume/median-width warrant and the accident warrants are effective in identifying locations for freeway barrier installation. The volume/median-width warrant normally identifies locations before cross-median accidents develop. The before-and-after study shows that median area accidents will increase 10 to 20 percent with barrier installation on freeways, and on non-freeways all accidents can increase 50 percent or more. Ten years of experience with the Median Barrier Monitoring System has been that the structure and process works well.

  • Corporate Authors:

    California Department of Transportation

    1120 N Street
    Sacramento, CA  United States  95814
  • Authors:
    • Seamons, L L
    • Smith, R N
  • Publication Date: 1991-6

Media Info

  • Pagination: 142 p.

Subject/Index Terms

  • Subject Areas: Design; Highways;

Filing Info

  • Accession Number: 00619635
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: CALTRANS-TE-90-2
  • Created Date: Feb 29 1992 12:00AM