Area-Wide Ramp Metering for Targeted Incidents: The Additive Increase, Multiplicative Decrease Method

AbstractRamp metering has been broadly accepted and deployed as an effective countermeasure against both recurrent and nonrecurrent congestion on freeways. However, several current ramp metering algorithms tend to optimize only freeway travels using local detectors’ inputs and overlook the negative impacts on local streets. This may generate two problems: (1) the optimal local settings may not result in a system-wide optimum in terms of traffic operations; and (2) the increased congestion on local streets due to on-ramp overflow may counteract the gains in freeway operations. To solve these problems for nonrecurrent cases, we propose an area-wide ramp metering (AIMD) system to coordinate the previously isolated ramp meters for system-wide optimization. This novel strategy for active ramp metering is inspired by the principles of a computer network congestion control algorithm. In this strategy, certain types of congestion at a targeted freeway location can be significantly reduced by limiting vehicle flow...

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