Details are given of the data collection procedures used, the analysis technique applied, and the results obtained in a large-scale study of speeds and flows on rural roads. Formulae were derived for predicting the average speed of vehicles at different levels of traffic flow on different types of road, by relating observed speeds to observed flows and road layout characteristics. Conclusions based on the study are presented. These relate to the effect of traffic compositions on speed/flow relations, the effect of hilliness and bendiness, the lack of clarity in the speed/flow effect, the multiple regression analysis of the effect of flows of light and heavy vehicles, the relation between journey speed and total flow, and the variation in the speed/flow slope from one section of the road to another.

  • 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:
    • Duncan, N C
  • Publication Date: 1974-7

Media Info

  • Pagination: 39 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00096284
  • Record Type: Publication
  • Report/Paper Numbers: PTRC/P/108
  • Files: ITRD, TRIS
  • Created Date: Sep 10 1975 12:00AM