Link choice proportions from trip distribution and assignment models: An overview and comparison

Hing Keung William Lam, H. J. Huang

Research output: Journal article publicationReview articleAcademic researchpeer-review

4 Citations (Scopus)


A number of estimation procedures have been suggested for the situation where a prior estimate of an origin-destination matrix is to be updated on the basis of recently-acquired traffic counts. These procedures assume that both the link flows and the proportionate usage of each link made by each origin-destination flow (referred to collectively as the link choice proportions) are known. This paper examines the possibility and methods for estimating the link choice proportions. Three methods are presented: (1) using ad hoc iteration between trip distribution and traffic assignment; (2) combining trip distribution and assignment in one step; (3) solving a new optimization problem in which the path flows are directly considered as variables and its optimal solution is governed by a logit type formula. The algorithms, covergencies and computational efficiencies of these methods are investigated. Results of testing the three methods on example networks are discussed.
Original languageEnglish
Pages (from-to)1-21
Number of pages21
JournalJournal of Advanced Transportation
Issue number1
Publication statusPublished - 1 Jan 1996

ASJC Scopus subject areas

  • Automotive Engineering
  • Economics and Econometrics
  • Mechanical Engineering
  • Computer Science Applications
  • Strategy and Management


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