OASIS: Optimal advanced system for integrated strategies


Type de document
Résumé / Abstract
This paper introduces a new approach to design the integrated motorway control strategies including ramp metering, motorway to motorway control and users guidance using variable message signs. The control strategies can help to meet objectives (such as reducing congestions) by optimizing a global criteria (such as minimizing the total time spent in the network traffic). The traffic process is simulated by using a non linear macroscopic model namely Metacor also used to evaluate the impact of the control strategies. Moreover the derivatives associated to Metacor equations are explicitely calculated, in order to apply fast and efficient non linear optimisation techniques. The optimization method used for the studies can be either the conjugate gradient or a recent algorithm called rprop. The same approach can also be applied in order to calibrate the simulation parameters on the basis of real traffic data selected under a broad spectrum of traffic conditions by minimizing the square errors between real and simulated traffic. For the control purposes a multilayer structure (adaptation, optimization and direct control layers) has been developed and tested in simulation and a generic tool named oasis (optimal advanced system for integrated strategies) has been implemented. The off-line simulation results reported in this paper have been conducted in the southern part of Paris Ile de France motorway network. The obtained results prove that the integrated control approach has a significant potential for the improvement of traffic network performance.

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