It is a special license plate for vehicles of government agencies and institutions. Yellow represents the identity of vehicle users, that is, government agencies or public institutions. The yellow number plate at the beginning of yl represents the special number plate for vehicles of government agencies and institutions, indicating that the vehicle is a motor vehicle with driving license and compulsory insurance business. The special identity of yellow yl license plate makes it have certain privileges during driving, such as parking at a specific time and place, passing through, etc.