CONVERGENCE MONITORING FOR CONGESTED ASSIGNMENT IN ROAD SCHEME APPRAISAL

A Department of Transport funded research project has investigated theoretical and practical approaches to convergence monitoring in the context of highway scheme appraisals. The aim of the project was to provide practitioners with guidance on which convergence measures to use to examine convergence, which stop criteria to aim for, and how to deal with cases on non-convergence or with any remaining uncertainty in the flow and associated delay forecasts. The research included a survey amongst practitioners and model developers, and multiple model applications using actual scheme appraisals and three commercial UK packages (CONTRAM, SATURN and TRIPS). The paper reports on the main research findings and proposes an appropriate approach to monitor convergence in practical applications. A two-stage procedure is recommended: (1) the first step seeks a satisfactory level of convergence of each individual assignment model, by meeting pre-specified criteria (this step applies to all applications of assignment); (2) the second step handles the remaining model uncertainty in terms of overall model outcomes (and is particularly applicable in highway scheme appraisal). (A) For the covering abstract see IRRD 877041.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/086050283X
• Corporate Authors:

  PTRC Education and Research Services Limited

  Glenthorne House, Hammersmith Grove
  London W6OL9,   England 
• Authors:
  • VAN VUREN, T
  • Harris, R
  • EMMERSON, P
• Conference:
  • TRANSPORTATION PLANNING METHODS. PROCEEDINGS OF SEMINAR E HELD AT THE 23RD EUROPEAN TRANSPORT FORUM, UNIVERSITY OF WARWICK, ENGLAND, SEPTEMBER 11-15, 1995. VOLUME P392
• Publication Date: 1995

Language

• English

Media Info

• Pagination: p. 91-101

Subject/Index Terms

• TRT Terms: Conferences; Mathematical models; Networks; Simulation; Traffic assignment; Traffic congestion; Traffic flow
• Uncontrolled Terms: Transportation networks
• ITRD Terms: 8525: Conference; 632: Congestion (traffic); 6473: Mathematical model; 1054: Network (traffic); 9103: Simulation; 679: Traffic assignment; 671: Traffic flow
• Subject Areas: Data and Information Technology; Operations and Traffic Management;

Filing Info

• Accession Number: 00722337
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-86050-283-X
• Files: ITRD
• Created Date: Jun 28 1996 12:00AM