This paper presents an equilibrium-based model of departure time choice and route choice as applicable to the modelling of changing peak profiles in a congested peak period. Departure time choice ("peak spreading") is formulated as an incremental logit model starting from an observed (base year) departure profile over discrete time slices. Changes in this profile are driven by changes in the generalised travel costs for each OD-pair in each time-slice, caused by e.g. future changes in demand and by the construction of highway schemes. Route choice within each time slice is assumed to obey Wardrop equilibrium. Under certain (specified) conditions the problem may be formulated as a convex minimisation problem leading to the formulation of solution algorithms. The algorithms applied are sufficiently robust that they may also be applied to formulations where these strict conditions do not apply, e.g. when queues in one time slice are carried forward to later time slices. The methods developed in this framework have been applied both to small test networks and to larger networks, in conjunction with a SOT-sponsored research study on modelling changes in peak profiles for road scheme appraisal as described in another PTRC abstract, "Advice on the modelling of changes in peak profiles for road scheme appraisal" (see IRRD 880183). For the covering abstract see IRRD 880168.


  • English

Media Info

  • Features: References;
  • Pagination: p. 165-76

Subject/Index Terms

Filing Info

  • Accession Number: 00724206
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-86050-283-X
  • Files: ITRD
  • Created Date: Aug 19 1996 12:00AM