The national standard for car transport mainly includes the following aspects: 

1, size standard 

The length of the car shall not exceed 12 meters, the width shall be limited to 2.55 meters, and the height of the loaded goods shall not exceed 4.2 meters. 

 The maximum length of the mid-axle vehicle is 22 meters, and the width and height limit after loading are the same as that of the single-axle vehicle. 

 2, carrying capacity: 

Coupes of this specification can carry up to five standard cars. 

3. Design requirements: 

The car carrier shall be a single bridge configuration and shall be designed to ensure safety and efficiency in transit. 

These standards are designed to ensure the safety and efficiency of car carriers in transit