viaduct vīˈədŭktˌ [key] [Lat.,=road conveyor], type of bridge for carrying a highway or railroad over a valley, over low ground, or over a road. It is commonly constructed in the form of several towers or piers that support arches on which the roadway rests. Viaducts are usually constructed of steel or concrete; in the past they were built of wood or stone. Examples of viaducts include the Pulaski Skyway in NE New Jersey and the Colorado Street Bridge in Pasadena, Calif. The world's longest viaduct, the Danyang-Kunshan Grand Bridge (102.4 mi/164.8 km), is part of the Nanjing to Shanghai section of the Beijing–Shanghai High-Speed Railway in China.

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