The background to the new design flow standards for motorways and rural all-purpose roads, the factors taken into account in formulating the criteria, and their application in future road schemes are outlined. The main factors which govern road layout are forecasts of traffic flow and assesment of traffic flow which each category of road will carry. The 'capacity' of a road is defined and discussed. Standards for rural motorways are discribed. Factors which decide design flow standards are: operating speeds, safety, driver comfort, wet conditions, rain or darkness, road maintenance, break down and accidents, and accesses and junctions.

  • Supplemental Notes:
    • Presented at Seminar X (Road Design 1: General Topics) of the PTRC Summer Annual Meeting, Warwick University, England, 8-12 July 1974.
  • Corporate Authors:

    Planning and Transport Res and Computation Co Ltd

    167 Oxford Street
    London W1R 1AH,   England 
  • Authors:
    • Duff, J T
  • Publication Date: 1974-7

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00096283
  • Record Type: Publication
  • Report/Paper Numbers: PTRC/P/108
  • Files: TRIS
  • Created Date: Sep 10 1975 12:00AM