In 1983 the state of Texas tried a French-manufactured Ka band radar for a time but discontinued its use because the units were being stolen right off the road. Some units function at night by using a flash. Many photo radars connect to a computer or printer to retrieve stored data statistics such as number of violations, time and speed of each violation, etc. Note that the registered vehicle owner may not be the driver, but the owner still gets the ticket. Some Safety Radars only display speeds above the limit, some display all speeds measured.
Some units record all speeds measured, some only record speed violations.
Safety Radars usually do not record the driver or vehicle, unless connected to a camera. Most laser radars can also measure the range of stationary objects. Many microwave radars can be used from a moving patrol car. Laser radars are not designed to operate from a moving patrol car. Typically microwave radars have longer detection range than laser light systems.