A MODIFIED LOCAL FEED-BACK RAMP METERING STRATEGY BASED ON FLOW STABILITY

In this contribution a modification of the ALINEA local on-ramp control strategy is presented. In this modification, as in ALINEA, the metering rate is determined by a feedback mechanism where the occupancy rate downstream of the merge area is used, yet a correction procedure is added, where the stability of the flow upstream of the merge area is used in order to fine-tune the metering rate. Preliminary results from microscopic simulation show that this alternative strategy may yield a significant higher throughput of on-ramp without deteriorating freeway operations.