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.

[VonLawson]

I remember seeing a very conspicuous warning sign by the railway once and wondered why U-turns weren't allowed there. Later, I realized that the road surface in rail areas is completely different from regular roads—there are raised steel tracks and possibly potholes, making it easy to scrape the undercarriage or even get wheels stuck with just a slight lapse in attention. What's even scarier is if you're halfway through a U-turn and a train suddenly comes, your car would be stuck horizontally on the tracks with no time to move away. Trains move so fast that their braking distance can be hundreds of meters—how could the driver possibly react in time? It's literally gambling with your life. There have been too many bloody lessons that led to this ironclad rule. Getting caught on camera means losing 6 points and 200 yuan—it's just not worth it.

[AdelynLee]

From a road design perspective, railway crossings typically only have space for a single lane, which is far from sufficient for a vehicle's turning radius. I've personally measured that an ordinary car requires at least 7-8 meters in width to make a U-turn, whereas crossings are often narrowed down to just 3-4 meters. Moreover, the rail gaps and signaling equipment at crossings are precision components, and repeated vehicle pressure or steering maneuvers could damage these critical parts. Most critically, performing a U-turn involves repeated back-and-forth movements, prolonging the time the front and rear of the vehicle occupy the track area multiple times over, effectively increasing the risk of collision with a train.

[ReidRose]

A friend of mine works at the railway bureau, and he said the dispatch room fears level crossing accidents the most. Nowadays, a train speed of 160 km/h is considered slow, and even if obstacles are spotted in advance, the braking distance starts at 600 meters. I've seen surveillance footage where a private car got its wheels stuck while making a U-turn at a crossing. The train honked and flashed its lights from far away, and the driver scrambled out in terror—five seconds later, the car was smashed to pieces. The more hidden danger is that when you're making a U-turn, your attention is entirely on checking for vehicles behind you, making it easy to overlook a high-speed train approaching from a distance. It's practically like walking straight into a death trap.