A COMPARISON OF THE SAFETY POTENTIAL OF THE RAISED VS DEPRESSED MEDIAN DESIGN

The purpose of this study was to determine the safety potential of the mound (raised) median design versus the swale (depressed) median design. Five sections of Interstate Highway were chosen for study and the single-vehicle accident experience for each section from 1969 throgh 1971 was analyzed. The study was structured to answer four basic questions which portrayed the relative safety potential of the two median designs. On the basis of the results of this study, the following conclusions concerning the safety potential of 84 foot wide medians of the mound (raised) and swale (raised) and swale (depressed) designs were reached: (1) the 84 foot wide median of either cross-sectional design provides a generally adequate recovery area for encroaching vehicles; (2) based on the disproportionately low frequency of reported accidents, the use of the swale median design for 84 foot wide medians provides more opportunity for encroaching vehicles to regain control and return to their roadway; (3) the use of either cross-sectional design for an 84 foot wide median has no effect on the primary path of the vehicle, on the vehicle's tendency to overturn, or on the resulting severity of the accident when a median encroachment results in a reported accident. /Author/

  • Corporate Authors:

    Ohio Department of Transportation

    Bureau of Traffic, 25 South Front Street
    Columbus, OH  USA  43215
  • Authors:
    • Foody, T J
    • Culp, T B
  • Publication Date: 1973-3

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 37 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00264006
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Report/Paper Numbers: #7301
  • Files: TRIS, STATEDOT
  • Created Date: Dec 31 1974 12:00AM