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AN MDP DECOMPOSITION APPROACH FOR TRAFFIC CONTROL AT ISOLATED SIGNALIZED INTERSECTIONS

Published online by Cambridge University Press:  25 September 2008

René Haijema  and
Jan van der Wal
René Haijema
Affiliation:
Department of Quantitative Economics Faculty of Economics and BusinessUniversity of Amsterdam1018WB Amsterdam, The Netherlands E-mail: [email protected]; [email protected]
Jan van der Wal
Affiliation:
Department of Quantitative Economics Faculty of Economics and BusinessUniversity of Amsterdam1018WB Amsterdam, The Netherlands E-mail: [email protected]; [email protected]
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Abstract

This article presents a novel approach for the dynamic control of a signalized intersection. At the intersection, there is a number of arrival flows of cars, each having a single queue (lane). The set of all flows is partitioned into disjoint combinations of nonconflicting flows that will receive green together. The dynamic control of the traffic lights is based on the numbers of cars waiting in the queues. The problem concerning when to switch (and which combination to serve next) is modeled as a Markovian decision process in discrete time. For large intersections (i.e., intersections with a large number of flows), the number of states becomes tremendously large, prohibiting straightforward optimization using value iteration or policy iteration. Starting from an optimal (or nearly optimal) fixed-cycle strategy, a one-step policy improvement is proposed that is easy to compute and is shown to give a close to optimal strategy for the dynamic problem.

Type
Research Article
Information
Probability in the Engineering and Informational Sciences , Volume 22 , Issue 4 , October 2008 , pp. 587 - 602
Copyright
Copyright © Cambridge University Press 2008

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