ESTIMATION OF TRIP MATRICES FROM VOLUME COUNTS. VALIDATION OF A MODEL UNDER CONGESTED CONDITIONS

The author has developed a model for the estimation of trip matrices from traffic counts based on an entropy maximising framework. The original model assumed that for each counted link it was possible to identify the proportion of the trips from each origin-destination (o-d) pair which would use it. Furthermore, it is usually assumed that this route choice proportion can be identified independently from the o-d estimation process. These assumptions are perhaps reasonable wherever congestion does not play a key role in route choice. This o-d estimation model was validated using a comprehensive data set collected by TRRL in the central area of Reading. The results of these tests were reported in a paper during the 8th International Symposium on Transportation and Traffic Theory in Toronto. The original model has now been extended to cope with cases where congestion does play a role in route choice. This extension of the model has been validated again with the same data base. It was found that the explanatory power of the model was improved at a moderate extra cost in computer resources. The improved model is likely to be of great interest in practioners as it makes possible the use of relatively inexpensive traffic counts to update and estimate trip matrices under a wide range of conditions. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0860501132
• Supplemental Notes:
  • This paper was presented during the proceedings of Seminar Q held at PTRC's 10th Annual Summer Meeting, Transportation Analysis and Models, Warwick University, England.
• Corporate Authors:

  PTRC Education and Research Services Limited

  110 Strand
  London WC2,   England 
• Authors:
  • WILLUMSEN, L G
• Conference:
  • Planning & Transport Res & Comp, Sum Ann Mtg, Proc
• Publication Date: 1982

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 311-323

Subject/Index Terms

• TRT Terms: Central business districts; Conferences; Itinerary; Mathematical matrices; Mathematical models; Origin and destination; Traffic congestion; Traffic counts; Traffic flow; Travel; Validation
• Uncontrolled Terms: Models; Selection; Trip
• Geographic Terms: United Kingdom
• ITRD Terms: 8525: Conference; 632: Congestion (traffic); 699: Itinerary; 6473: Mathematical model; 687: Origin destination traffic; 9072: Selection; 311: Town centre; 689: Traffic count; 671: Traffic flow; 8119: United Kingdom
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I71: Traffic Theory;

Filing Info

• Accession Number: 00381641
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-86050-113-2
• Report/Paper Numbers: REPORT
• Files: ITRD, TRIS
• Created Date: Apr 30 1984 12:00AM