Evaluation of dynamic recommended variable speed limits for motorway traffic control (MCS) on E4 in Stockholm using micro-simulation

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A sophisticated traffic management system (MCS) has been implemented on the E4 motorway through Stockholm. The system generates variable advisory speed messages (VSL) triggered by automatic incident detection (AID) alarms for downstream queues and congestion. The MCS was introduced to deal with special traffic circumstances such as accidents, lane closures, and high congestion. The traffic impacts of the system were quantitatively evaluated through extensive field studies of driver behaviour using video recordings and data collected from the MCS detectors. Further studies have been performed focusing on system impacts on the speed-density relationships, which were statistically analyzed regarding difference between traffic conditions before and after the implementation of VSL. This paper describes use of the micro-simulation model VISSIM for traffic impact evaluation of MCS.

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