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Webinar Available


Ramp Metering for Postponing Freeway Breakdown

Thursday, October 22
3:30 p.m. - 4:30 p.m. CDT
Room 1130, Mechanical Engineering Building

Part of the Fall 2009 Advanced Transportation Technologies Seminar Series and CTS Seminar Series.

In conjunction with the CTS Transportation Safety and Traffic Flow Council meeting, which begins at 2:00 p.m.

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Ramp management is one of several functions performed on a daily basis to maximize the use of existing capacity. This seminar will present procedures developed through research (NCHRP 3-87) for implementing ramp-management strategies at freeway sections that regularly experience breakdown and operate under congested conditions. These procedures can assist agencies in improving freeway ramp metering system performance by delaying or preventing freeway-flow breakdown, and by increasing throughput.

Researchers first developed a process for obtaining breakdown probability models for existing critical ramps. Field data were collected at six freeway corridors around the United States, and breakdown probability models were developed for these using the proposed process. Researchers concluded that incorporating the probability of breakdown concept into an existing ramp-metering algorithm seems to be a promising method for reducing the time of congestion. When applying the proposed enhancements, breakdown probability models should be developed for all critical ramps within a freeway system.

Read the full article for more information


Lily (Ageliki) Elefteriadou is director of the Transportation Research Center (TRC) and the Kisinger Campo Professor of Civil Engineering at the University of Florida. She has served as the principal investigator for various federal and state projects funded by the National Cooperative Highway Research Program (NCHRP), the National Science Foundation (NSF), the Federal Highway Administration, PennDOT, and Florida DOT. She is currently the principal investigator of the USDOT-funded “Center for Congestion Mitigation Strategies,” a Tier-1 University Transportation Center. Her research focuses on highway capacity, traffic operations, and traffic simulation.


Seminars also will be broadcast live on the Web and available for later viewing. See the Webinar viewing instructions for more information.

More information

Contact Shawn Haag, 612-625-5608 or