This paper proposes a macroscopic fundamental diagram (MFD)-based perimeter control approach for coordinated ramp metering, aiming to minimize the total time spent (TTS) of a freeway network (stretch) with multiple bottlenecks. To address problems incurred from limited queue storage space and minimum green time at on-ramps, the proposed method extends previous approaches in two aspects. Firstly, a coordinated ramp control approach is proposed to ensure that the total metered on-ramp flow remains below the value determined by the MFD-based perimeter regulator, thereby preventing network over-saturation. Secondly, a novel queue management approach is developed to prevent on-ramp queue saturation and its associated side effects, for example, spillback or insufficient control actions. This approach determines the quasi-optimal flow of the next upstream (slave) on-ramp, based on the predicted queue of each (master) on-ramp suffering from excessive queues. The proposed perimeter controller was tested using SUMO, a microscopic simulator, on a realistic freeway network, and compared with other existing strategies, including HERO and perimeter controllers with other metered on-ramp flow distribution approaches. The simulation results suggest that the proposed strategy can ( i ) effectively mitigate congestion and maintain capacity within the freeway network, resulting in reduced overall TTS, and ( ii ) appropriately delay or prevent queue saturation at on-ramps.


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    Title :

    Perimeter Control-Based Coordinated Ramp Metering with Linked Queue Management for Freeway Networks


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:
    He, Ziang (author) / Han, Yu (author) / Guo, Weihong (author) / Ji, Yanjie (author) / Liu, Pan (author)


    Publication date :

    2024-08-08




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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