In part 1, a brief investigation of the development of curve design is made. In part 2, the present technique for estimating side friction factors is analysed and criticised. In part 3, measurements of vehicle speeds and swept paths, made in this project, are compared with similar measurements made by Glennon and Weaver in 1971, and others. A good relationship between curve radius and friction factors is established, and the implications for curve design discussed. It is concluded that current design techniques are somewhat incompatible with actual driver behaviour. A good relationship between curve radius and various percentile speeds is also established. In part 4, current spiral curve designs are described. The possibility of, and evidence for spirals being an actual potential hazard to safety are discussed. (Author/TRRL)

  • Corporate Authors:

    Portsmouth Polytechnic, England

    Department of Civil Engineering, Burnaby Road
    Portsmouth, Hampshire,   England 
  • Authors:
    • Bell, N G
  • Publication Date: 1980-6

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 94 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00334837
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: Project Rpt 32 79/80Monograph
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1981 12:00AM