Ramp metering and freeway bottleneck capacity
The objective of this study is to determine whether ramp meters increase the capacity of active freeway bottlenecks, and if they do, how. The traffic flow characteristics at twenty-seven active bottlenecks in the Twin Cities have been studied for seven weeks without ramp metering and seven weeks with ramp metering. A series of hypotheses regarding the relationships between ramp metering and the capacity of active bottlenecks are developed and tested against empirical traffic data. It is found that meters increase the bottleneck capacity by postponing and sometimes eliminating bottleneck activations (a 73 percent increase in the duration of the pre-queue transition period), accommodating higher (2 percent) flows during the pre-queue transition period, and increasing queue discharge flow rates after breakdown (3 percent). The two-capacity hypothesis about flow drops after breakdown was also examined and results strongly suggest the percentage flow drops at various bottlenecks follow a normal distribution (mean 5.5 percent, standard deviation 2.3 percent). The implications of these findings on the design of efficient ramp control strategies are discussed, as well as future research directions.
|Date of creation:||Jul 2003|
|Date of revision:|
|Publication status:||Published in Transportation Research: A Policy and Practice 44(4), May 2010, pp. 218-235.|
|Contact details of provider:|| Postal: Dept. of Civil Engineering, 500 Pillsbury Drive SE, Minneapolis, MN 55455|
Phone: +01 (612) 625-6354
Fax: +01 (612) 626-7750
Web page: http://nexus.umn.edu
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- Lei Zhang & David Levinson, 2002. "Estimation of Demand Response to Ramp Metering," Working Papers 200207, University of Minnesota: Nexus Research Group.
- David Levinson & Lei Zhang, 2006.
"Ramp Meters on Trial: Evidence from the Twin Cities Metering Holiday,"
200604, University of Minnesota: Nexus Research Group.
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"Optimal Freeway Ramp Control without Origin-Destination Information,"
200404, University of Minnesota: Nexus Research Group.
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- David Levinson & Atif Sheikh, 2002. "Traffic Equilibration: The Case of the Twin Cities Ramp Meter Shut Off," Working Papers 200206, University of Minnesota: Nexus Research Group.
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