Ramp metering, speed management and braess-like paradoxes
LEBACQUE ; HAJ-SALEM
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
LEBACQUE ; HAJ-SALEM
Résumé / Abstract
Intervention parue en 2003 dans Transportation Research Board. The paper investigates the origin of the gains resulting from ramp metering and speed management. Both traffic control methods reduce the nominal capacity in order to achieve gains, a situation similar to braess's paradox. Ramp metering and speed control are shown to prevent capacity drops from which the system is unable to recover, due to hysteresis. This is the main origin of the gains. A simple intersection model based on first order macroscopic traffic modelling and the local traffic supply and demand concept help explaining this phenomenon. It is also shown that by combining both control strategies, greater gains can be achieved, and that improvement of traffic flow can be expected even in congested quasi-static situations.
