A new freeway ramp control objective - minimizing total weighted travel time is presented in this study. This new objective function is capable of balancing efficiency and equity of ramp meters, while the previous metering objective - minimizing total absolute travel time is purely efficiency-oriented and hence produces a most efficient but least equitable solution. When certain assumptions hold, this metering objective is shown to be equal to minimizing non-linearly weighted ramp delay. A simulation method to achieve the new metering objective is developed and demonstrated using the example of BEEX, a new ramp control strategy also developed in this study, in a microscopic traffic simulator.
Zhang, Lei and David Levinson (2005) Balancing Efficiency and Equity of Ramp Meters. ASCE Journal of Transportation Engineering 131(6) 477-481.
Minnesota Department of Transportation
Zhang, Lei; Levinson, David M.
Balancing Efficiency and Equity of Ramp Meters.
American Society of Civil Engineers.
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