Case of a car have a stopping such as there is a barrier or checkpoint. A car will have a queuing and cover a license plate of previous car.
This case should let a camera recognize a license plate of first car in the row.
For not let have covering a license plate and let select a position of license plate recognition before car stop for let a system can recognize a license plate before a car stop such as 3 meters before to a front car in the forefront etc.