Why is U-turn prohibited at railway crossings?

[Joanne]

Reasons for prohibiting U-turns at railway crossings: Making a U-turn at a railway crossing can easily cause traffic accidents. According to relevant regulations, motor vehicles are not allowed to make U-turns at locations with no U-turn or no left-turn signs or markings, as well as at railway crossings, pedestrian crossings, bridges, sharp curves, steep slopes, tunnels, or other dangerous sections of the road. Motor vehicles can make U-turns at locations without no U-turn or no left-turn signs or markings, but they must not obstruct the passage of other normally moving vehicles and pedestrians; at locations where U-turns are permitted and special U-turn traffic lights are installed, U-turns should be made during the green light. If there are no U-turn traffic lights but there are corresponding signs indicating U-turns during red or green lights, the U-turn should be made following the instructions of the signs.