DYNAMIC PCU AND ESTIMATION OF CAPACITY OF URBAN ROADS

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.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/1790571
• 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

Language

• 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

• TRT Terms: Calculation; Forecasting; Highway capacity; Mathematical analysis; Mathematical models; Passenger car equivalence; Passenger cars; Regression analysis; Speed; Traffic flow; Traffic lanes; Vehicle mix; Vehicles; Width
• ITRD Terms: 6471: Analysis (math); 6464: Calculation; 643: Capacity (road, footway); 2992: Carriageway; 132: Forecast; 6473: Mathematical model; 651: Passenger car unit; 6588: Regression analysis; 5408: Speed; 641: Traffic composition; 671: Traffic flow; 1255: Vehicle; 6479: Width
• Subject Areas: Data and Information Technology; Highways; Vehicles and Equipment;

Filing Info

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