A bridge is a structure that spans over an obstacle such as a river or a valley to allow people or vehicles to cross it. A viaduct, on the other hand, is an elevated bridge-like structure that consists of a series of spans, usually supported by arches or piers. Viaducts are typically used to cross valleys, canyons, or other low-lying areas where a bridge would not be practical, and can be considerably longer than a typical bridge. In summary, a bridge is a single span structure, while a viaduct is a complex of multiple spans or arches.
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