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- W1867233773 abstract "This paper points out some relevant facts related to the use of current observed flows to update (or adjust, estimate) origin-destination (O-D) demand matrices that are considered out-of-date. The updating of such matrices by using traffic counts is a common practice for achieving short term forecasts without the use of a full scale update of a demand forecasting model in the absence of new survey data. The practice is quite common and several O-D adjustment methods are available in some commercial packages used in practice today. A short survey of the methods that have been developed for matrix adjustment is presented in this paper. Due to its practical importance, the adjustment of an O-D matrix by using observed flows (counts) on the links and turns of a transportation planning network has attracted the attention of many researchers. The methods proposed may be subdivided into two categories, depending whether the network considered is assigned constant travel times (uncongested) or flow-dependent (congested) travel times. When the network considered for the O-D matrix adjustment is subject to congestion the underlying route choice method is an equilibrium assignment. In this case the O-D matrix adjustment method may be formulated as a bi-level optimization problem or, as others denote such problems, a mathematical programming problem with equilibrium constraints (MPEC). Several of these methods have been implemented in practice, and are used on a regular basis for the adjustment of an out-of-date O-D matrix for the evaluation of contemplated network changes for a short term planning horizon. In the following a multi-class O-D adjustment model is formulated, a solution algorithm is developed and numerical results are reported. The inclusion of the demand term into the simultaneous class formulation and the resulting gradient based algorithm are new developments." @default.
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- W1867233773 date "2009-01-01" @default.
- W1867233773 modified "2023-09-24" @default.
- W1867233773 title "The Adjustment/Estimation of O-D Matrices: Some Caveats" @default.
- W1867233773 hasPublicationYear "2009" @default.
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