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Title: A Pareto-optimization approach for a fair ramp metering
Authors: Meng, Q. 
Khoo, H.L.
Keywords: Cell-transmission model
Multiobjective optimization model
Ramp metering
Issue Date: Aug-2010
Citation: Meng, Q., Khoo, H.L. (2010-08). A Pareto-optimization approach for a fair ramp metering. Transportation Research Part C: Emerging Technologies 18 (4) : 489-506. ScholarBank@NUS Repository.
Abstract: This paper deals with a fair ramp metering problem which takes into account average travel delay distribution among on-ramps for an expressway system comprising expressways, on-ramps and off-ramps. A novel spatial equity index is defined to measure the evenness of travel delay distribution among on-ramps within the predefined on-ramp groups. An ideal fair ramp metering problem therefore aims to find an optimal dynamic ramp metering rate solution that not only minimizes the total system delay, but also maximizes the equity indexes associated to the groups. Some of these objectives, however, contradict with each other, and their Pareto-optimality is explored. The fair ramp metering problem proposed in this paper is formulated as a multiobjective optimization model incorporating a modified cell-transmission model (MCTM) that captures dynamic traffic flow pattern with ramp metering operations. The MCTM then is embedded in the Non-dominated Sorting Genetic Algorithm II (NSGA-II) to solve the multiobjective optimization model. Finally, the Interstate I-210. W expressway-ramp network in the United States is adopted to assess the methodology proposed in this paper. © 2009 Elsevier Ltd.
Source Title: Transportation Research Part C: Emerging Technologies
ISSN: 0968090X
DOI: 10.1016/j.trc.2009.10.001
Appears in Collections:Staff Publications

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