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Evaluation of Four Control Algorithms Used in Variable Speed Limit Systems
Linköping University, Department of Science and Technology, Communications and Transport Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-5531-0274
Swedish National Road and Transport Research Institute (VTI), Linköping, Sweden.
Division of Transport Planning, Economics and Engineering, Department of Transportation Sciences, Royal Institute of Technology (KTH), Stockholm, Sweden.
2016 (English)In: TRB 95th Annual Meeting Compendium of Papers, Washington: Transportation Research Board , 2016, 16-2880Conference paper (Refereed)
Abstract [en]

Control algorithms used for deciding on the speed limits in variable speed limit systems are crucial for the performance of the system. Today, many of the control algorithms used are based on fixed thresholds in speed and/or flow for lowering and increasing the speed limit. The algorithms are not necessarily reflecting the conditions on the road, which might lead to low traffic efficiency. Our hypothesis is that by use of a simple and efficient control algorithm that is better in reflecting the conditions on the road, both traffic efficiency and traffic safety could be increased. In this study, four control algorithms used in variable speed limit systems, and fulfilling the above criteria, are evealuted through microscopic traffic simulation. Performance indicators related to traffic safety, traffic efficiency and environmental impacts are presented. The results show that the design of, and the objective with, the control algorithm have a great impact on the performance. Moreover, the time needed for incident detection, the duration of and the size of the speed limit reduction and the location of the congestion are of importance for the performance of the control algorithms. These results will be of importance for design and implementation of future efficient variable speed limit systems.

Place, publisher, year, edition, pages
Washington: Transportation Research Board , 2016. 16-2880
Keyword [en]
variable speed limit systems, control algorithms, microscopic traffic simulation
National Category
Transport Systems and Logistics
URN: urn:nbn:se:liu:diva-129518OAI: diva2:940025
Transportation Research Board 95th Annual Meeting, Washington D.C., USA, January 10-14, 2016
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2016-06-29Bibliographically approved

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Grumert, EllenTapani, Andreas
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