The performance of local-responsive and three coordinated ramp metering methods—Denver Helper, Minnesota Zone, and Seattle Bottleneck algorithms—were evaluated using simulation. They were adapted to the study site, a 10-mile section of I-15 north of Salt Lake City. Reductions in total travel time in freeway main flow for the entire simulated freeway section during AM and PM peak hour varied from 0% to 2% depending on the metering method, traffic volume, and time of day (AM and PM peak hour). When only congested freeway links were analyzed for each 15-minute interval of the AM and PM peak hour, reductions in travel time in freeway main flow ranged from 0% to about 30%; however, in some cases, travel time increased. High reductions in travel time at congested links were offset by the increases and decreases in travel times in other links in the freeway when the entire simulated freeway system was analyzed for one peak hour. Also, all the tested metering methods increased on-ramp travel time (i.e., delay), offsetting 30% to almost 100% of the total travel time saved for the freeway main flow. The analysis resulted in mixed results indicating the benefits of these algorithms are not always guaranteed.


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    Title :

    Evaluating the Benefits of Coordinated Ramp Metering Algorithms Using WATSIM


    Contributors:

    Conference:

    Eighth International Conference on Applications of Advanced Technologies in Transportation Engineering (AATTE) ; 2004 ; Beijing, China



    Publication date :

    2004-05-13




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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