The invention relates to a variable speed limit (VSL), ramp metering (RM), and a collaborative method of variable speed limit and ramp metering (VSL-RM) on expressways based on crash risk, including the following steps: 1) calculating the crash risk index within each control step, activating the VSL-RM strategy when the crash risk index exceeds the threshold of the crash risk index, and 2) conduct a multiple-ramp metering strategy, determine the ramps to be controlled and the start-up time for RM, and calculate the integrated ramp regulation rate; 3) execute a variable speed limit strategy to obtain the displayed speed limit value for the segment downstream of the cluster and adjust the ramp regulation rate, mainline desired speed and mainline speed of the segment for the next time period accordingly.


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    Title :

    Collaborative controlling method of variable speed limit and ramp metering for expressways based on crash risk


    Contributors:
    MA WANJING (author) / HE ZILIANG (author) / WANG LING (author) / YU CHUNHUI (author)

    Publication date :

    2022-10-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS



    COLLABORATIVE CONTROLLING METHOD OF VARIABLE SPEED LIMIT AND RAMP METERING FOR EXPRESSWAYS BASED ON CRASH RISK

    MA WANJING / HE ZILIANG / WANG LING et al. | European Patent Office | 2022

    Free access

    Ramp Metering and Speed Limit Control Coordination Strategy on Urban Expressways

    Zhang, Dekang / Shi, Jianjun / Li, Pengfei et al. | ASCE | 2018