An S bridge is a bridge whose alignment follows a reverse curve, shaped roughly like a shallow letter S in plan, used in early 19th-century road construction in the United States. They were generally used for crossing small, curving streams with uneven banks.
An S bridge is a bridge whose alignment follows a reverse curve, shaped roughly like a shallow letter S in plan, used in early 19th-century road construction in the United States. They were generally used for crossing small, curving streams with uneven banks.
Source: Wikipedia "S bridge" · CC BY-SA 4.0
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