Is it illegal to install a roof box on a sedan?

[LaJocelyn]

Installing a roof box on a sedan is not illegal. However, the load must not exceed the maximum load capacity specified in the vehicle's registration certificate, and the length and width of the load must not extend beyond the vehicle body. Here are its advantages: 1. Low wind resistance and noise: The wind resistance and noise of a roof box are much lower than those of a roof basket or other carrying equipment. Roof baskets or soft roof bags with irregular shapes after loading other equipment create higher wind resistance and noise. Roof boxes are designed with a streamlined shape. 2. High theft resistance: The theft resistance of a roof box is much higher than that of other carrying equipment. Roof boxes generally come standard with locks, and some upgraded roof boxes are made of ABS+ASA/PMMA material, which cannot be easily cut with ordinary knives.