Photo-radar is a method used to enforce speed limits. Photos are taken of speeders and notices of violation are mailed to the vehicles' registered owners. Citations are sometimes issued based upon the evidence of the photograph. At this time, there are no active automated speed enforcement systems in the State of Texas. The cameras at several intersections in Cedar Park are used to operate the traffic signals. Instead of magnetic induction loops placed in the pavement, these intersections use video cameras for detection of approaching vehicles. The cameras have no law enforcement application.