The Virginia Department of Transportation (VDOT) has invested in extensive closed circuit television (CCTV) systems to monitor freeways in urban areas. Generally, these devices are installed as part of freeway management systems (Smart Traffic Centers (STCs)). Although CCTVs have proven to be very effective in supporting incident management, they simply provide images that must be interpreted by trained operators-not measures of traffic conditions (such as flow rate and average speeds). A previous study completed by the University of Virginia and Virginia Transportation Research Council concluded, however, that it is feasible to integrate CCTV with video image vehicle detection systems (VIVDS) currently on the market to provide the ability to measure traffic conditions. The purpose of this research effort was to develop, deploy, and evaluate an integrated CCTV/VIVDS system (referred to as Phase II Autotrack) in an operational STC.


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