This paper presents a concept of 'dynamic passenger car unit' ('dynamic PCU'), appropriate for the heterogeneous traffic on Indian roads, and shows that the PCU factor for a vehicle type is not a static factor as is usually assumed. This PCU factor is the ratio of the projected rectangular area of the vehicle type, as a proportion of that of a car, to the velocity of the vehicle type, as a proportion of car velocity. The velocities for different vehicle types are found by solving a set of linear simultaneous equations, whose coefficients depend on: (1) traffic stream composition; (2) the road's total mixed traffic flow per unit time; (3) total carriageway width; and (4) parameters to be estimated by linear regression analysis. Variations of dynamic PCUs are plotted, in relation to traffic composition, for a section of the Delhi Ring Road, for the following vehicle classes: (1) car/jeep/taxi; (2) bus/minibus/truck; (3) motorised three-wheeler; (4) motorised two-wheeler; and (5) bicycle. Speed-flow relationships and road capacity estimates are also discussed.

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  • Corporate Authors:

    Indian Roads Congress

    Jamnagar House, Shahjahan Road
    New Delhi,   India  110 011
  • Authors:
    • Chandra, S
    • Kumar, V
    • SIKDAR, P K
  • Publication Date: 1995-4


  • English

Media Info

  • Features: References;
  • Pagination: p. 17-28
  • Serial:
    • Indian Highways
    • Volume: 23
    • Issue Number: 4
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 00713444
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, ATRI
  • Created Date: Nov 22 1995 12:00AM