The Virginia Department of Transportation (VDOT) established a highway assistance service called Safety Service Patrol. This service wanted to automate the Incident Management System (IMS) to get more accurate driver information, including arrival/departure times and incident locations and to better track vehicle and driver locations. To achieve this it used 35 MDCs equipped with internal GPS receiver and two-way data messaging, RASTRAC AVL software to track vehicles on the interstate and CDPD wireless network. The system is configured so that GPS coordinates are transmitted in real time from the MDC to the AVL software via the CDPD network.
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