what is mean by via ducts??

vi·a·duct. A series of spans or arches used to carry a road or railroad over a wide valley or over other roads or railroads.
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A viaduct is a bridge composed of several small spans for crossing a valley, dry or wetland, or forming an overpass or flyover.
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VIA DUCT is a long bridge-like structure, typically a series of arches, carrying a road or railway across a valley or other low ground.
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