Underground crossing

In a traffic system with relatively congested and complex traffic, there will be some non-surface traffic networks running through them, mostly underground sidewalks.

A passageway built under the urban ground for people to walk. Pedestrians can pass through in large numbers, quickly and safely, solving pedestrian traffic congestion and safety problems in big cities, and at the same time beautifying the city's landscape. It can be used for evacuation and shelter during wartime. They are mainly set up near traffic intersections and stations. Of course, they are also set up near scenic spots, such as bus stations, train stations, intersections, entrances and exits of scenic spots and roads, etc.; they consist of simple small platforms, handrails, stairs, and 30° It consists of elevators, lights, exhaust outlets, sewers and very long or short cement and mosaic pavements. Pedestrians use elevators or escalators to go up and down; the underground part is made of thicker concrete cement and thicker steel bars to ensure the bearing capacity of the top surface. Underground tunnels are generally divided into two types: shallow burial and deep burial. The former generally buries the section tunnels under the streets, and the lines generally run along the street, are longer, and are usually constructed using the open-cut method; the latter tunnels are deeper, and pass under them without being affected by the buildings on the ground, and the lines are longer. Short, shield tunneling method or mining method is required for construction.