ALINEA: a local traffic responsive strategy for ramp metering. Field results on A6 motorway in Paris

ALINEA, a local feedback ramp metering strategy, has been experimented on the A6 motorway around Paris on four consecutive on-ramps. This paper summarizes the field results achieved and presents the main features of ALINEA. The impact of ramp metering is studied by comparative evaluation of a number of performance indices in the cases with and without control. The main finding of the field trial is that the application of an efficient ramp metering strategy considerably improves the traffic conditions on the motorway. The reported results indicate the ease of application, flexibility, and high efficiency of ALINEA. Planned future implementations are briefly outlined.