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Optimal Motorway Traffic Flow Control Involving Variable Speed Limits and Ramp Metering
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Optimal Motorway Traffic Flow Control Involving Variable Speed Limits and Ramp Metering
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Journal Article
Optimal Motorway Traffic Flow Control Involving Variable Speed Limits and Ramp Metering
2010
Overview
The impact of variable speed limits (VSL) on aggregate traffic flow behaviour on motorways is shown to bear similarities to the impact of ramp metering, in particular, when addressing potentially active bottlenecks. A quantitative model of the VSL impact is proposed that allows for VSL to be incorporated in a macroscopic second-order traffic flow model as an additional control component. The integrated motorway network traffic control problem involving ramp metering and VSL control measures is formulated as a constrained discrete-time optimal control problem and is solved efficiently even for large-scale networks by a suitable feasible direction algorithm. An illustrative example of a hypothetical motorway stretch is investigated under different control scenarios, and it is shown that traffic flow efficiency can be substantially improved when VSL control measures are used, particularly in integration with coordinated ramp metering.
Publisher
INFORMS,Transportation Science & Logistic Society of the Institute for Operations Research and Management Sciences,Transportation Science Section, Institute for Operations Research and the Management Sciences,Institute for Operations Research and the Management Sciences
Subject
/ Autobahn
/ Control
/ Electric driving, Variable speed
/ Exact sciences and technology
/ Ground, air and sea transportation, marine construction
/ Highways
/ Measures
/ Networks
/ Road transportation and traffic
/ Speed
/ Studies
/ Traffic
/ Transportation planning, management and economics
/ Vehicles
