East-west street of a Roman camp or town. The square grid layout of the two was basically identical and the decumanus usually ran from the gate in the middle of one wall to the gate opposite. The decumanus maximus was the main east-west street. The main transverse street was known as the cardo; the administrative block or forum was at the intersection of the two. Other decumani parallel to the decumanus maximus cross the transverse cardines to divide the area into insulae.
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See cardo.