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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 roadways.

Some well-known viaducts include:

• Bloor Street Viaduct
• Millau viaduct

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