Legal basis: Article 13 of the Regulations for the Implementation of the Road Traffic Safety Law should be hung at designated positions in front of and behind the vehicle to keep it clear and complete. Heavy and medium-sized trucks and their trailers, tractors and their trailers shall be painted with enlarged brand numbers at the rear of the carriage, and the words shall be correct and clear. Motor vehicle inspection signs and insurance signs shall be affixed to the upper right corner of the front window of the motor vehicle. Motor vehicle spraying, labeling or body advertising shall not affect safe driving.