Abstract
This paper considers control in road networks. Using a simple example based on the well-known Braess network [1] the paper shows that reducing delay for traffic, assuming that the traffic distribution is fixed, may increase delay when travellers change their travel choices in light of changes in control settings and hence delays. It is shown that a similar effect occurs within signal controlled networks. In this case the effect appears at first sight to be much stronger: the overall capacity of a network may be substantially reduced by utilising standard responsive signal control algorithms. In seeking to reduce delays for existing flows, these policies do not allow properly for consequent routeing changes by travellers. Control methods for signal-controlled networks that do take proper account of the reactions of users are suggested; these require further research, development, and careful real-life trials.
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© 2009 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering
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Smith, M. (2009). Intelligent Control of Urban Road Networks: Algorithms, Systems and Communications. In: Mehmood, R., Cerqueira, E., Piesiewicz, R., Chlamtac, I. (eds) Communications Infrastructure. Systems and Applications in Europe. EuropeComm 2009. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 16. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-11284-3_13
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DOI: https://doi.org/10.1007/978-3-642-11284-3_13
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