Guido Schäfer Senior researcher, Centrum Wiskunde & Informatica (CWI), Amsterdam, the Netherlands and Professor, Vrije Universiteit, Amsterdam, the NetherlandsCongestion in traffic networks has several negative effects as it causes environmental pollution, waste of natural resources and time, stress on the traffic participants, etc. With the increase in traffic in recent years, it becomes an increasingly important issue to implement regulation means that efficiently reduce congestion in networks. In this context, road pricing has long been recognized as being one of the most effective regulation means.

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