Abstract

A unifying review of four independently developed deterministic macroscopic control-oriented models of multi-lane freeway traffic is presented. It is shown that all models can be deduced from a common set of three basic laws of traffic flow: the conservation equation, the volume-density characteristic and the dynamics of the mean speed. Based on each of these models optimal control problems are formulated. Their efficiency in preventing or eliminating freeway traffic congestions is discussed in some detail. Concluding, a multilayer control structure as a base for an efficient form of practical freeway traffic control systems is outlined.

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