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in Seattle is an example of another common use for the viaduct, allowing an increase in traffic capacity within a limited space.]] A viaduct is a Bridge that connects points of equal height in a landscape, usually by bridging a river Valley or other eroded opening in an otherwise flat area. Often such valleys have roads descending either side (with a small bridge over the river, where necessary) that become inadequate for the traffic load, necessitating a viaduct for through traffic. Such bridges also lend themselves for use by Rail traffic, which requires straighter and flatter routes. The term ''viaduct'' is derived from the Latin ''via'' for road and ''ductus'' to conduct something. However the Ancient Romans did not use that term per se, it is a modern derivation from an analogy with Aqueduct . {Link without Title} REFERENCES SEE ALSO
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