Abstract
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 30%; however, in some cases, travel time increased. High reductions is 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 method increased on-ramp travel time (i.e., delay), offsetting 30% to almost 100% of the 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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