COST AND SAFETY EFFECTIVENESS OF HIGHWAY DESIGN ELEMENTS

The objectives of this research were (1) to identify the key geometric characteristics and combinations of characteristics of road and street designs that affect accident frequencies and severity; (2) to quantify the effects of varying the key characteristics and combinations of characteristics on accident frequencies and severity; and (3) to develop a methodology that can be used by engineers in measuring the cost effectiveness of the various levels of each design element. Because only a limited number of design elements could be studied in-depth during this research, the features of pavement width, shoulder width, and shoulder surface type for rural two-lane highways were selected for quantifying their relationship to accident frequencies and severity. No significant difference was found in the accident rate between 22-ft and 24-ft pavement widths. There was a measurable difference between the 18-, 20-, and 22-ft pavements, with the wider pavements having lower accident rates. Wider shoulders and paved shoulders were also found to have lower accident rates. A cost-safety-effectiveness methodology was developed to incorporate the quantified relationships into a practical design procedure. /Author/

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 237 p.
  • Serial:
    • NCHRP Report
    • Issue Number: 197
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614

Subject/Index Terms

Filing Info

  • Accession Number: 00189840
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Apr 12 1979 12:00AM