Are the objective and solutions of dynamic user-equilibrium models always consistent?

Wei Hua Lin, Hong K. Lo

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Existing dynamic user-equilibrium traffic assignment (DUETA) models are mostly expanded from the static user-equilibrium traffic assignment model by introducing the time dimension along with a group of additional constraints. Whereas the equivalency between the solution to the traffic assignment model and the user-equilibrium condition as defined by Wardrop is well established in the static case, the same may not be true for the dynamic case. This paper examines the general form of DUETA models as proposed in previous research and shows that, if queuing behavior is represented in the model at a minimal level, the solution to conventional DUETA models with an objective function of the form adopted by most existing formulations may not necessarily converge to or approximate the Wardropian user-equilibrium condition in the dynamic sense as defined by many researchers.

Original languageEnglish (US)
Pages (from-to)137-144
Number of pages8
JournalTransportation Research Part A: Policy and Practice
Issue number2
StatePublished - Feb 1 2000


  • Dynamic traffic assignment
  • Mathematical programming
  • Optimal control
  • Traffic flow
  • User equilibrium

ASJC Scopus subject areas

  • Aerospace Engineering
  • Business, Management and Accounting (miscellaneous)
  • Transportation
  • Civil and Structural Engineering
  • Management Science and Operations Research


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