A combined activity/travel choice model for congested road networks with queues

Hing Keung William Lam, Hai Jun Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)


This paper presents a combined activity/travel choice model and proposes a flow-swapping method for obtaining the model's dynamic user equilibrium solution on congested road network with queues. The activities of individuals are characterized by given temporal utility profiles. Three typical activities, which can be observed in morning peak period, namely at-home activity, non-work activity on the way from home to workplace and work-purpose activity, will be considered in the model. The former two activities always occur together with the third obligatory activity. These three activities constitute typical activity/travel patterns in time-space dimension. At the equilibrium, each combined activity/travel pattern, in terms of chosen location/route/departure time, should have identical generalized disutility (or utility) experienced actually. This equilibrium can be expressed as a discrete-time, finite-dimensional variational inequality formulation and then converted to an equivalent "zero-extreme value" minimization problem. An algorithm, which iteratively adjusts the non-work activity location, corresponding route and departure time choices to reach an extreme point of the minimization problem, is proposed. A numerical example with a capacity constrained network is used to illustrate the performance of the proposed model and solution algorithm.
Original languageEnglish
Pages (from-to)3-29
Number of pages27
Issue number1
Publication statusPublished - 1 Feb 2002


  • Activity-based travel behavior
  • Dynamic user-equilibrium assignment
  • Location/route/departure time choices
  • Queuing network

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Development

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