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Optimal Freeway Ramp Control without Origin-Destination Information

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Author Info
Lei Zhang
David Levinson () (Nexus (Networks, Economics, and Urban Systems) Research Group, Department of Civil Engineering, University of Minnesota)

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Abstract

This paper develops an analytical framework for ramp metering, under which various ramp control strategies can be viewed as ramifications of the same most-efficient control logic with different threshold values, control methods, and equity considerations. The most-efficient control logic only meters the entrance ramps nearest critical freeway mainline sections so as to eliminate freeway internal queues, which is derived from a new formulation of the optimal ramp control problem. Instead of assuming the availability of real-time origin-destination information, the new formulation takes advantages of the stability and predictability of off-ramp exit percentages. Those properties of the off-ramp exit percentages are supported by empirical data, and allow us to formulate the optimal ramp control problem as a linear program whose input variables are all directly measurable by detectors in real-time. The solution is also tested on a real-world freeway section in a microscopic traffic simulator for demonstration. Time-dependent origin/destination tables and off-ramp exit percentages are compared as two alternative ways to represent the true real-time demand patterns that are important to freeway ramp metering.

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File URL: http://nexus.umn.edu/Papers/OptimalRampMetering.pdf
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File URL: http://dx.doi.org/doi:10.1016/j.trb.2003.11.003
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Publisher Info
Paper provided by University of Minnesota: Nexus Research Group in its series Working Papers with number 200404.

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Date of creation: 2004
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Publication status: Published in Transportation Research part B Volume 38, Issue 10, December 2004, Pages 869-887. [
Handle: RePEc:nex:wpaper:optimalrampmetering

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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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Related research
Keywords: Ramp metering; Freeway operations; OD table; Off-ramp exit percentage;

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Find related papers by JEL classification:
R40 - Urban, Rural, and Regional Economics - - Transportation Systems - - - General

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