Ridgeland, SC now operates speed detection devices on I-95 North and South lanes from an unmarked RV parked on the side of the road. No police officer is dispatched to cite individual drivers. Instead, a fine appears in the mail a few weeks later.

Since its introduction in August, the town’s use of automated traffic cameras on I-95 has been criticized by drivers and some state officials who say Ridgeland is intentionally skirting a state law passed in July that outlawed citations "based solely on photographic evidence."

Town officials counter that the law applies only to unmanned cameras. In Ridgeland, a police officer operates and monitors radar and camera equipment inside an RV parked along the interstate.

http://www.islandpacket.com/2010/12/18/1483738/ridgelands-i-95-traffic-camera.html