What does U-shaped driving mean?

[VanAlex]

U-shaped driving refers to the driving method of entering the highway from the same station, making a U-turn in the middle, and then exiting from the same station. Highway positioning: Highways are a type of road classified by technical grade, with a higher level than first-class, second-class, third-class, fourth-class, and substandard roads. Highways intersect with national or provincial roads in the hierarchical classification of the road network, meaning highways are part of national or provincial roads in the road network. Precautions for highway driving: When driving normally on a highway, vehicles in the same lane must maintain a sufficient safe distance based on driving speed, weather, and road conditions. Under normal circumstances, when the speed is 100km/h, the safe distance should be more than 100m; when the speed is below 100km/h, the safe distance can be appropriately reduced, but the minimum distance should not be less than 50m.