The Importance of Traffic Flow Modeling for Motorway Traffic Control
 A. Kotsialos,
 M. Papageorgiou
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Abstract
The problem of traffic congestion in modern day motorways calls for the design and implementation of efficient control strategies. It is argued in this paper that in order to have efficient, generic, and systematic solutions to a wide range of traffic control problems, macroscopic motorway traffic flow models in statespace form, that are relevant for the control problem and computationally nonintensive, are most appropriate. Such models allow the exploitation of available powerful, systematic, and theoretically supported automatic control concepts. Based on these concepts an Extended Kalman Filter for traffic state estimation, a multivariable LQI controller for coordinated ramp metering on a motorway stretch, and an integrated optimal control strategy for motorway networks are shortly presented. The criteria of a model's relevance for a given traffic control problem and its computational requirements are subsequently examined. Finally, the application of an advanced coordinated ramp metering control strategy, based on the optimal control approach, to the ringroad of Amsterdam, The Netherlands, is provided as an illustrative example.
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 Title
 The Importance of Traffic Flow Modeling for Motorway Traffic Control
 Journal

Networks and Spatial Economics
Volume 1, Issue 12 , pp 179203
 Cover Date
 20010301
 DOI
 10.1023/A:1011537329508
 Print ISSN
 1566113X
 Online ISSN
 15729427
 Publisher
 Kluwer Academic Publishers
 Additional Links
 Topics
 Keywords

 traffic control
 traffic flow models
 traffic state estimation
 ramp metering
 optimal control
 Authors

 A. Kotsialos ^{(1)}
 M. Papageorgiou ^{(1)}
 Author Affiliations

 1. Dynamic Systems and Simulation Laboratory, Technical University of Crete, 73100, Chania, Greece