The main objective of the study was to develop improved speed/flow relationships which would be applicable to a wider range of gradient characteristics, overall levels of traffic flow and the vehicle composition of the flow on such roads. An additional objective was to undertake an appraisal of the effect on speed/flow relationships of the road geometry, the weather, day of week and time period of day. 21 sites were surveyed, 2 of these being split into 2, making a total of 23 sites for analysis. The sites covered as wide a range of hilliness and bendiness as possible, and full range of road types. Details are given of the site selection and collection of data on journey speed and traffic flow. Multiple linear regression analysis was used to develop models that describe as much of the variation in the observed speeds as possible. (TRRL)

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 17-36
  • Serial:
    • Issue Number: P184

Subject/Index Terms

Filing Info

  • Accession Number: 00325640
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 086050-065-9
  • Files: ITRD, TRIS
  • Created Date: Oct 28 1981 12:00AM