A viaduct is a bridge composed of several small spans. The term viaduct is derived from the Latin via for road and ducere to lead something. However, the ancient Romans did not use that term per se; it is a modern derivation from an analogy with aqueduct.[citation needed] Like the Roman aqueducts, many early viaducts comprised a series of arches of roughly equal length. Viaducts may span land or water or both.
The longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France. Viaducts are commonly used in many cities which are railroad centers, such as Chicago, Atlanta, Birmingham, London, and Manchester. These viaducts cross the large railroad yards that are needed for freight trains there, and also cross the multi-track railroad lines that are needed for heavy railroad traffic. These viaducts keep highway and city street traffic from having to be continually interrupted by the train traffic.[citation needed] Likewise, some viaducts carry railroads over large valleys, or they carry railroads over cities with lots of cross-streets and avenues. The example of Viaduct on Expressways are Alabang Viaduct in South Luzon Expressway in Muntinlupa City, Philippines that crosses Alabang-Zapote Road in Barangay Alabang the viaduct reaches until Filinvest Interchange. In the north the Pulilan-Apalit Viaduct known as Candaba viaduct in North Luzon Expressway in Philippines is raised over the Candaba swamp from Pulilan, Bulacan until it reaches Apalit, Pampanga. This keeps the highway open to traffic, even when the swamp gets flooded during the rainy season. It has a view of Mt. Arayat, which is the lone mountain in Central Plain of Luzon.
A viaduct is a bridge composed of several small spans. The term viaduct is derived from the Latin via for road and ducere to lead something. However, the ancient Romans did not use that term per se; it is a modern derivation from an analogy with aqueduct.[citation needed] Like the Roman aqueducts, many early viaducts comprised a series of arches of roughly equal length. Viaducts may span land or water or both.
The longest viaduct in antiquity may have been the Pont Serme which crossed wide marshes in southern France. Viaducts are commonly used in many cities which are railroad centers, such as Chicago, Atlanta, Birmingham, London, and Manchester. These viaducts cross the large railroad yards that are needed for freight trains there, and also cross the multi-track railroad lines that are needed for heavy railroad traffic. These viaducts keep highway and city street traffic from having to be continually interrupted by the train traffic.[citation needed] Likewise, some viaducts carry railroads over large valleys, or they carry railroads over cities with lots of cross-streets and avenues. The example of Viaduct on Expressways are Alabang Viaduct in South Luzon Expressway in Muntinlupa City, Philippines that crosses Alabang-Zapote Road in Barangay Alabang the viaduct reaches until Filinvest Interchange. In the north the Pulilan-Apalit Viaduct known as Candaba viaduct in North Luzon Expressway in Philippines is raised over the Candaba swamp from Pulilan, Bulacan until it reaches Apalit, Pampanga. This keeps the highway open to traffic, even when the swamp gets flooded during the rainy season. It has a view of Mt. Arayat, which is the lone mountain in Central Plain of Luzon.