Authors: Published: 09 Oct 2015

Abstract

Variable speed limits (VSL) is an emerging ITS tool, which can help to improve safety and efficiency of motorway systems through a better harmonization of traffic flow. It can reduce variation in speed of vehicles travelling along the controlled section. The implementation of VSL encourages a uniform driving behavior and thus resulting in a better distribution of traffic over the motorway network, and better utilization of the road infrastructure. In this study, we assessed the mobility benefits of VSL under different driver compliance levels. The analysis of this work is based on a critical bottleneck section of Auckland Motorway using Aimsun micro-simulator. We systematically tested three different VSL control algorithms for the study section that include an occupancy based VSL control algorithm, a flow based VSL control algorithm and a logic-tree based VSL control algorithm. The simulation results of the case study show that VSL control cases resulted in significant improvements in total travel time, CO2, CO and NOx emissions compared with a no-control scenario.
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