If there is a roof rack on the driving license photo, the roof box can be installed legally. Pursuant to Article 54 of the "Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China", motor vehicle loads shall not exceed the load capacity approved on the motor vehicle driving license, and the load length and width shall not exceed the carriage, and the following regulations shall be complied with: Except for the luggage rack outside the body and the built-in luggage, no cargo is allowed. The height of the luggage rack of passenger cars shall not exceed 0.5 meters from the roof, and the height from the ground shall not exceed 4 meters. It should be noted here that the height of the selected roof luggage box after installation must not exceed 0.5 meters from the roof. The underground garage of the general community is 2.2 meters, and the total height after installation is generally within 2 meters.