Analysis of a cooperative variable speed limit system using microscopic traffic simulation |
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| Institution: | 1. Swedish National Road and Transport Research Institute (VTI), SE-581 95 Linköping, Sweden;2. Linköping University, Department of Science and Technology (ITN), SE-601 74 Norrköping, Sweden;3. ITS Lab, Traffic and Logistics, Department of Transportation Sciences, Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden;1. Department of Automation, Xiamen University, Xiamen 361005, PR China;2. Department of Civil and Environmental Engineering, California Institute for Telecommunications and Information Technology, Institute of Transportation Studies, 4000 Anteater Instruction and Research Bldg, University of California, Irvine, CA 92697-3600, USA;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. Department of Civil and Environmental Engineering, University of South Florida, FL 33620, USA;2. Surface Transportation Division, Leidos, Inc., Reston, VA 20190, USA;3. Department of Civil and Architectural Engineering and Construction Management, University of Cincinnati, Cincinnati, OH 45221, USA;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: | Variable speed limit systems where variable message signs are used to show speed limits adjusted to the prevailing road or traffic conditions are installed on motorways in many countries. The objectives of variable speed limit system installations are often to decrease the number of accidents and to increase traffic efficiency. Currently, there is an interest in exploring the potential of cooperative intelligent transport systems including communication between vehicles and/or vehicles and the infrastructure. In this paper, we study the potential benefits of introducing infrastructure to vehicle communication, autonomous vehicle control and individualized speed limits in variable speed limit systems. We do this by proposing a cooperative variable speed limit system as an extension of an existing variable speed limit system. In the proposed system, communication between the infrastructure and the vehicles is used to transmit variable speed limits to upstream vehicles before the variable message signs become visible to the drivers. The system is evaluated by the means of microscopic traffic simulation. Traffic efficiency and environmental effects are considered in the analysis. The results of the study show benefits of the infrastructure to vehicle communication, autonomous vehicle control and individualized speed limits for variable speed limit systems in the form of lower acceleration rates and thereby harmonized traffic flow and reduced exhaust emissions. |
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| Keywords: | Cooperative systems Intelligent transport systems Infrastructure to vehicle communication Variable speed limit Microscopic traffic simulation Emission model |
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