Each day, up to 50,000 cars travel on the connected corridors of Macomb County where GM and the U.S. Army field test autonomous vehicles on a regular basis.  The county's Communications and Technology Center (COMTEC) serves as the hub of activity for real time traffic operations monitoring.  To date, the system includes 152 miles of connected roadway, 220 Dedicated Short Range Communications (DSRC) roadside radios, 220 traffic monitoring cameras and 19 communication backhaul poles.