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- W614094616 abstract "Subnetwork analysis is often used in traffic assignment problems to reduce the size of the network being analyzed, with a corresponding decrease in computation time. This is particularly important in network design, second-best pricing, or other bilevel problems in which many equilibrium runs must be solved as a subproblem to a master optimization program. A fixed trip table based on an equilibrium path flow solution is often used, but this ignores important attraction and diversion effects as drivers (globally) change routes in response to (local) subnetwork changes. This paper presents an approach for replacing a regional network with a smaller one, containing of the subnetwork, and zones. Artificial arcs are created to represent all paths'' between each origin and subnetwork boundary node. The primary contribution of the paper is a procedure for estimating a cost function on these artificial arcs, using derivatives of the equilibrium travel times between the end nodes. A bush-based representation allows rapid calculation of these derivatives. Two methods are presented, one based on network transformations and resembling techniques used in the analysis of resistive circuits, and another based on iterated solution of a nested set of linear equations. Demonstration on a small network shows substantial improvement in accuracy as compared to using a fixed table, even when only a first-order linear approximation is used." @default.
- W614094616 created "2016-06-24" @default.
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- W614094616 date "2011-01-01" @default.
- W614094616 modified "2023-09-26" @default.
- W614094616 title "Subnetwork Trip Table Generation with Bush-Based Sensitivity Analysis" @default.
- W614094616 hasPublicationYear "2011" @default.
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