What is the purpose of the box on the car roof?

[MacNoah]

The box on the car roof is called a roof box or roof luggage case, known in English as Roof-box. It is installed on the car roof to expand storage space, allowing for the transportation of more self-driving equipment, luggage, and other items. Here is some relevant information: 1. Reasons for installation: Not all items are suitable for placement inside the car, such as skis, various outdoor equipment, and protective gear. If these must be placed inside the car, they may occupy a significant amount of space, which is not conducive to keeping the car clean and could even pose a safety hazard. 2. Target users: People in European and American countries enjoy outdoor sports, camping, adventures, and pure exercise, often carrying a large amount of personal equipment. For some group activities, when going out, the car often carries multiple people, leaving insufficient space for several people's equipment. The roof box is popular for its streamlined shape, large storage space, small wind resistance, and designs that protect against wind, theft, and sand dust.