Toronto's Prince Edward Viaduct bridges the Don valley; road traffic uses the upper deck, and rail traffic uses the lower deck.

The Alaskan Way Viaduct 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. Bloor Viaduct, Toronto. ... Bloor Viaduct, Toronto. ... The Bloor Street Viaduct, or simply the Viaduct, is the popular name of a bridge that spans the Don River Valley in Toronto, Ontario, Canada, crossing over the Don Valley Parkway and Bayview Avenue as well as the river. ... The Don River is one of two rivers bounding the original settled area of Toronto, Canada along the shore of Lake Ontario, the other being the Humber River to the west. ... A subway train pulls into St. ... The Alaskan Way Viaduct in Seattle, Washington from Victor Steinbrueck Park. ... The Alaskan Way Viaduct in Seattle, Washington from Victor Steinbrueck Park. ... The Alaskan Way Viaduct, looking southeast The Alaskan Way Viaduct is an elevated section of Washington State Route 99 that runs along the Elliott Bay waterfront in Seattles Industrial District and downtown. ... City nickname Emerald City City bird Great Blue Heron City flower Dahlia City mottos The City of Flowers The City of Goodwill City song Seattle, the Peerless City Mayor Greg Nickels County King County Area   - Total   - Land   - Water   - % water 369. ... This article is about the edifice (it is primarily an index to articles concerning specific bridge types). ... Fljótsdalur in East-Iceland A valley is a landform, which can range from a few square miles (square kilometers) to hundreds or even thousands of square miles (square kilometers) in area. ... Rail transport refers to the land transport of passengers and goods along railways or railroads. ...

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. [1] It has been suggested that History of the Latin language be merged into this article or section. ... Pont du Gard, France, a Roman aqueduct built circa 19 BC. It is one of Frances top tourist attractions and a World Heritage Site. ...

References

• Online etymology dictionary

See also

• Category:Viaducts - for all articles about specific viaducts.