VOLUME-DENSITY RELATIONSHIPS AND THEIR USE IN THE STUDY AND PREVENTION OF KINEMATIC WAVES IN TRAFFIC

In this study of density-flow relationships of traffic or a high-speed, high-density highway, fixed time-interval photographs were taken of a marked section of a highway. The photographs were taken from a helicopter, enabling all traffic measurements to be translated leisurely at a later time. This avoided the limitations of other techniques commonly used for traffic measurement which require several different devices and observers to record density-flow relationships. The final plans included four one-hour flights above the highway section at selected times during the summer months. Unfortunately, no traffic 'jams' occurred during the filming but one sustained kinematic wave was observed. This report has been extended beyond the original objectives of the study to include traffic characteristics by lanes and relationships of traffic characteristics between lanes. Data analysis was reduced to the plotting of curves by computer for review and presentation. Approximately 750 pages of curves were printed and many of those presented are either envelope or 'best-fit' curves of 'mass-diagrams', each representing at least 1100 bit of data. During the study, conclusions were made concerning the nature of kinematic waves, the nature and direction of wave travel, and the diffusion of kinematic waves. From the analysis of data recommendations were also made towards improvement of highway operation and safety on the highways studies.

  • Corporate Authors:

    Ontario Ministry of Transportation & Communic, Can

    Research and Development Division, 1201 Wilson Avenue
    Downsview, ONo M3M 1J8,   Canada 
  • Authors:
    • Wheeler, R J
    • Troy, E M
  • Publication Date: 1966

Subject/Index Terms

Filing Info

  • Accession Number: 00125458
  • Record Type: Publication
  • Report/Paper Numbers: RB112
  • Files: TRIS
  • Created Date: Dec 3 1975 12:00AM