Abstract
The goal of this paper is to describe a generic approach to the problem of optimal coordinated ramp metering control in large-scale motorway networks. In this approach, the traffic flow process is macroscopically modelled by use of a second-order macroscopic traffic flow model. The overall problem of coordinated ramp metering is formulated as a constrained discrete-time nonlinear optimal control problem, and a feasible-direction nonlinear optimisation algorithm is employed for its numerical solution. The control strategy's efficiency is demonstrated through its application to the 32km Amsterdam ring-road for a number of different scenarios. The results of the presented approach are very promising and demonstrate the efficiency of the optimal control methodology for motorway traffic control problems.
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