Sight distance is a basic element of geometric road design and the standards set for minimum acceptable values of sight distance have a direct bearing on the cost of a road. This paper sets out the results of a study into the sight distance requirements of rural roads. This study involved a literature search, examination of some research results, and an analysis of the practices of various road authorities. While clear cut guidelines for the setting of minimum standards were not found in the literature or in the results of research, it was concluded that sufficient knowledge existed to enable satisfactory standards to be set. The traditional concepts of stopping and overtaking sight distance are examined and it is concluded that a different approach may be warranted. Different bases for the assessment of the minimum sight distance requirements and for overtaking requirements are suggested and values for design are given. While the various aspects of rural sight distance requirements are discussed, particular attention is given to the design of crest vertical curves. /Author/TRRL/


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 32-44
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00165696
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS, ATRI
  • Created Date: Apr 26 1978 12:00AM