Generalised Equilibrium Modelling: an Integrated Framework for Transport Planning.
LOGIE D M W, MVA, HEYDECKER B G, University College London, SMITH M J, University of York, UK
Methods based around Wardrop Equilibrium (Wardrop (1952)) and Beckmann's objective function (Beckmann (1956)) are long established for the case of simple highway modelling. The aim of Generalised Equilibrium (GE) modelling, and the project giving rise to
Methods based around Wardrop Equilibrium (Wardrop (1952)) and Beckmann's objective function (Beckmann (1956)) are long established for the case of simple highway modelling. The aim of Generalised Equilibrium (GE) modelling, and the project giving rise to this paper, is to use the notion of network-based equilibrium modelling to address a more general set of transport modelling issues. GE modelling should be understood as a modelling framework which allows these matters to be modelled, rather than implying a single specific model.
The development of GE modelling is being carded out as part of an 18 month UK Government LINK project part sponsored by DETR, EPSRC, and ESKC. This paper reports on the situation as the project enters its final phase. The orientation of the project has been one of research; but the solution methods have been implemented in new network software being developed by MVA for its TRIPS modelling software to provide a clear avenue for possible commercial exploitation, which is an objective of the LINK scheme. The project partners are MVA, the York Network Control Group at the Department of Mathematics University of York, and the University of London Centre for Transport Studies.
The focus of this paper is to provide a broad overview of GE modelling and it offers an outline of the main mathematical approach. Further mathematical details are currently available in unpublished working papers (Smith and Xiang (1998a, 1998b), Heydecker (1998a, 1998b)).
Association for European Transport