Comparative analysis of operational algorithms for coordinated ramp metering

Eil Kwon, Sreemannarayan Nanduri, Rich Lau, James Aswegan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


The performance of three different types of traffic-responsive, coordinated ramp metering strategies is analyzed using simulation. The selected metering approaches include the incremental group coordination method being implemented in Denver, Colorado; the fuzzy logic-based, implicit coordination approach from Seattle, Washington; and the bottleneck-based, sectionwide explicit coordination strategy being operated in Minnesota. The macroscopic simulation analysis using a 16-mi (25.7-km) freeway section in Minneapolis, Minnesota, indicated that the incremental coordination approach adopting a queue-override policy resulted in consistently less restrictive metering than did the other two algorithm. Further, the Minnesota system, which does not employ a ramp queue management policy, produced more evenly distributed traffic patterns on the mainline, whereas the fuzzy metering algorithm showed more flexibility in dealing with the atypical demand pattern than did the other metering approaches.

Original languageEnglish (US)
Pages (from-to)144-152
Number of pages9
JournalTransportation Research Record
Issue number1748
StatePublished - Jan 1 2001


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