What Is a Viaduct? | Wonderopolis
https://www.wonderopolis.org/wonder/what-is-a-viaduct
WebViaducts usually consist of a series of multiple bridges connected by a series of arch structures or spans between tall towers made of stone, concrete, iron, or steel. Viaducts usually connect two points of terrain similar in height for the purpose of carrying rail or automobile traffic across a valley, gorge, canyon, or street traffic.
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