A fuzzy logic ramp metering algorithm was implemented on 126 ramps in the greater Seattle area. Two multiple-ramp study sites were evaluated by comparing the fuzzy logic controller (FLC) to the other two ramp metering algorithms in operation at those sites over a four-month period. At the first study site, the days when the FLC was metering had lower mainline occupancies and higher throughput volumes in comparison to the days when the local algorithm was metering. At the second study site, the days when the FLC was metering had mainline occupancies that were similar, queues that were shorter, and throughput that was similar to the days when the bottleneck algorithm was metering.
May 17, 2007
Cynthia Taylor, Deidre Meldrum.
Washington State Transportation Center (TRAC)
- # of Pages: 62 p., 424 KB (PDF)
- Subject: Algorithms, Computer programs, Design, Freeway operations, Fuzzy logic, Implementation, Performance evaluations, Ramp metering, Simulation, Software, Testing, Traffic congestion, Traffic flow.
- Keywords: Ramp metering, fuzzy logic control, intelligent transportation systems, freeway operations, transportation management software, Seattle Metropolitan Area.
- Related Publications:
Algorithm Design, User Interface, and Optimization Procedure for a Fuzzy Logic Ramp Metering Algorithm: A Training Manual for Freeway Operations Engineers, (WA-RD 481.1).
A Programmer's Guide to the Fuzzy Logic Ramp Metering Algorithm: Software Design, Integration, Testing, and Evaluation, (WA-RD 481.3).
This abstract was last modified April 29, 2008