A quasi-dynamic traffic assignment model with time-dependent queues

Hing Keung William Lam, H. P. Lo, Ning Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


A quasi-dynamic traffic assignment model is proposed,in which the traffic demand is time-varying and the queues are time-dependent under the quasi-dynamic condition. The proposed model can estimate simultaneously traffic flows and queues in the network at various time intervals andlor under different traffic conditions, especially when the total traffic demand exceeds the network capacity in the peak period. By carrying queues over from one time interval to the next, the temporary over-loading of the network which characterises peak periods can be allowed for. Steady state conditions are assumed within each time interval, so avoiding difficulties with first-infirst-out (FIFO) in the queuing process. A mathematical programming model, where optimal solution satisfies the user equilibrium condition, is developed for the timevarying traffic assignment with time-dependent queues. Numerical examples are given to illustrate its applications.
Original languageEnglish
Pages (from-to)7-14
Number of pages8
JournalHKIE Transactions Hong Kong Institution of Engineers
Issue number2
Publication statusPublished - 1 Jan 1996


  • Dynamic traffic assignment
  • Time-dependent queues and time-varying traffic demand

ASJC Scopus subject areas

  • General Engineering


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