When High Pressure Automatic Car Wash Equipment were becoming popular, many car wash manufacturers opted to go for Laser sensor to sense the vehicles, so that they could sense the vehicle even when the high pressure pumps were operative. The conventional infrared sensors get blinded by the water mist of the High Pressure Automatic Car Wash Equipment causing false signal to the car wash equipment controller PLC.

Using laser for car wash equipment had further problems, since laser travel in a straight line with very little deflection and a very very narrow range of detection, even minor deflection or vibration of car wash equipment trolley caused the controller to falsely understand the presence of vehicle. Such vibrations are like, starting of the trolley, starting of high pressure pumps etc.

These car wash manufacturers store the car data in the PLC and use it during the further passes.