There must be no buildings within a few meters of the viaduct under construction.

There must be no buildings within 500 meters of the viaduct under construction.

Viaduct refers to a bridge built on a series of narrow reinforced concrete or masonry arches, with high supporting towers or pillars, spanning valleys, rivers, roads or other low obstacles. After the development of the city, traffic congestion and dense buildings make it difficult to widen the streets. Using this kind of bridge can disperse traffic density and improve transportation efficiency. In addition, in order to avoid crossing other line planes, save land and reduce subgrade settlement (in some areas), this kind of bridge can be used instead of embankment. Viaduct is not only a physical bridge, but also a metaphor of difficulties and setbacks.