The safety implications of geometric standards

The information available to assess safety effectiveness at the levels of network policy decisions, specification of standards, and detail design is reviewed. It is concluded that there is sufficient information available to assess the relative safety effectiveness of different road types, particularly comparing freeways with conventional roads. It should also be possible to assess the safety performance of conventional roads classified according to overall geometric standard. Studies of accident rates related to pavement width suggest that the most safety effective pavement width standard is about 6.8 M. The relationships between accident rates and standards for other individual geometric elements are not clear, and the consistency of alignment standard appears to be as important as the standards adopted for individual alignment elements. There is an apparent lack of information at the detailed level which can be used by designers to assess the safety implications of detail design decisions. It is suggested that safety benefits may be obtained by recognising, and designing to reinforce, the relationship between driver behaviour and perceived overall standard (a).


  • English

Media Info

  • Pagination: 185-97
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 01439248
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 642057044
  • Files: ATRI
  • Created Date: Aug 24 2012 10:06PM