Successful operation of ramp-metering needs to provide both an adequate queue storage space and a sufficient acceleration length at a metered on-ramp. This paper reviewed the existing methodologies and practices pertaining to queue storage and acceleration length design at metered on-ramps, and identified challenges that need to be solved during the metered on-ramp geometric design process. It was summarized that the development of metered on-ramp queue storage design guideline needs to consider the impact of on-ramp traffic flow arrival pattern on the actual queue storage needs at various metered on-ramp types. Meanwhile, considering the potential impact of ramp-metering on drivers’ acceleration behavior, it is necessary to develop dedicated acceleration lane length design standards for metered on-ramps based on field collected acceleration performance data. In addition, it is desirable to establish clear ramp geometric warrants to enhance the existing ramp-metering warrants presented in the MUTCD and local ramp meter design guidelines.


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    Title :

    Geometric design of metered on-ramps: state-of-the-practice and remaining challenges


    Contributors:
    Yang, Guangchuan (author) / Wang, Zhongren (author) / Tian, Zong (author) / Zhao, Laura Y (author) / Xu, Hao (author)

    Published in:

    Transportation Letters ; 12 , 9 ; 649-658


    Publication date :

    2020-10-20


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown





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