Integrated feedback ramp metering and mainstream traffic flow control on motorways using variable speed limits |
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| Institution: | 1. Center for Mobility Engineering and Post-graduate Program in Automation and Systems, Federal University of Santa Catarina, Campus Joinville, 89218-000 Joinville, SC, Brazil;2. Dynamic Systems and Simulation Laboratory, Department of Production Engineering and Management, Technical University of Crete, University Campus, 73100 Chania-Crete, Greece;1. Department of Civil and Environmental Engineering, University of Wisconsin – Madison, 1415 Engineering Drive, Madison, WI 53706, United States;2. Department of Civil and Environmental Engineering, University of Wisconsin – Madison, 1208 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706, United States;3. Delft University of Technology, Faculty of Civil Engineering & Geosciences, Department of Transport & Planning, P.O. Box 5048, 2600 GA Delft, The Netherlands;1. School of Transportation Engineering, Tongji University, 4800 Cao’an Road, 201804 Shanghai, China;2. Department of Civil, Environmental and Construction Engineering, University of Central Florida, Orlando, FL 32816-2450, United States |
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| Abstract: | Ramp metering (RM) is the most direct and efficient tool for the motorway traffic flow management. However, because of the usually short length of the on-ramps, RM is typically deactivated to avoid interference of the created ramp queue with adjacent street traffic. By the integration of local RM with mainstream traffic flow control (MTFC) enabled via variable speed limits (VSL), control operation upstream of active bottlenecks could be continued even if the on-ramp is full or if the RM lower bound has been reached. Such integration is proposed via the extension of an existing local cascade feedback controller for MTFC-VSL by use of a split-range-like scheme that allows different control periods for RM and MTFC-VSL. The new integrated controller remains simple yet efficient and suitable for field implementation. The controller is evaluated in simulation for a real motorway infrastructure (a ring-road) fed with real (measured) demands and compared to stand-alone RM or MTFC-VSL, both with feedback and optimal control results. The controller’s performance is shown to meet the specifications and to approach the optimal control results for the investigated scenario. |
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| Keywords: | Traffic management Integrated motorway traffic flow control Ramp metering Mainstream traffic flow control Variable speed limits Feedback control Optimal control |
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