CONGESTION ANALYSIS AND DIAGNOSIS IN UTC (URBAN TRAFFIC CONTROL) NETWORKS

Urban area traffic signal networks in the UK are generally controlled by an Urban Traffic Control (UTC) system based either on Fixed Time plans using Transyt or the traffic responsive system SCOOT. While SCOOT has been proved to be effective in achieving significant savings in delay, its delay-minimisation objective may not be the most effective technique for networks with a high level of congestion. The paper describes simulation studies to evaluate the mechanism by which congestion spreads and to investigate situations where SCOOT in its normal mode, looses effectiveness. Based on these studies a new measure of congestion called "Wasted Capacity" has been developed and is used in a proposed method for diagnosing congestion and indicating the need for remedial congestion strategies. An example of its use using real data from an area in London using SCOOT is detailed.

  • Corporate Authors:

    TRL

    Crowthorne House, Nine Mile Ride
    Wokingham, Berkshire  United Kingdom  RG40 3GA
  • Authors:
    • Wood, K
    • PALMER, J P
    • BRETHERTON, R D
  • Publication Date: 1994

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00668768
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Nov 16 1994 12:00AM