There are several main reasons why the tunnel is curved. The first is the light problem. The tunnel is curved, which can better avoid the glare when leaving the tunnel. Secondly, it is influenced by the train speed and air in the tunnel. In addition, the sound and terrain will also affect the tunnel. The tunnel is curved, which can avoid the bad and easy-to-collapse terrain and ensure its safety.

Why is the tunnel winding?

The tunnel is curved, because it can better avoid glare caused by direct light to people's eyes and cause dangerous accidents. When we drive out of the tunnel, the contrast between light and shade will make people temporarily invisible, and the tunnel bend can alleviate this phenomenon to some extent and reduce the occurrence of traffic accidents.

The curve in the tunnel can effectively control the speed of the vehicle in the tunnel and prevent the vehicle from going too fast. If the tunnel is not curved, air will form convection, which will lead to the formation of DC wind in the tunnel, and DC wind can even be fatal sometimes. Curved tunnels can hinder air convection to some extent and reduce potential dangers.

When we pass through the tunnel, we often hear a lot of noise inside the tunnel, and if the tunnel is not a bend, it will also lead to mutual interference between cars, which will lead to traffic accidents. In the construction, we often encounter some bad geology. In order to avoid these bad geology, the tunnel bending can make its structure safer and prevent collapse.