There is no simple relation between traffic volume as a parameter determined locally and traffic concentration as an instantaneous parameter. The relations indicated by WARD-ROP are valid only on the basis of a flow homogeneous in space and time and only for the expected values of the traffic parameters. It is not possible to determine numerically the random and systematic errors which can occur in the use of these relations. Nevertheless, they are frequently used in traffic engineering today. A consistent definition of the variables "traffic volume" and "traffic concentration" has been given by COERS. The so-called space-time parameters defined there may be considered as the true parameters. However, their measurement in real traffic flow requires extraordinary efforts. Therefore, local or quasi-local measurements of traffic flow will continue to be important. The error due to local determination of traffic parameters must of course be recognized. Mathematical-statistical concepts of the relation between both groups of parameters have been elaborated to assess this error. These deductions have been supplemented by results of measurements on two-lane rural highways and of simulations. Results indicate that parameters determined locally constitute sufficient approximation to the corresponding space-time parameters. The errors due these approximations can be calculated on the basis of the ideas outlined. Especially for two-lane roads the differences between local parameters and space-time parameters have been quantified. /Author/

  • Supplemental Notes:
    • Proceedings of the 6th International Symposium on Transportation and Traffic Theory held at the University of New South Wales, Sydney, Australia from 26-28 August 1974.
  • Corporate Authors:

    Elsevier Publishing Company, Incorporated

    52 Vanderbilt Avenue
    New York, NY  United States  10017
  • Authors:
    • Brilon, W
  • Conference:
  • Publication Date: 1974-8

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 203-229
  • Serial:
    • Volume: 6

Subject/Index Terms

Filing Info

  • Accession Number: 00099277
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 10 1975 12:00AM