Detour

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A detour or (British English: diversion) is a (normally temporary) route taking traffic around an area of prohibited or reduced access, such as a construction site. Standard operating procedure for many roads departments is to route any detour over roads within the same jurisdiction as the road with the obstructed area.

On multi-lane highways (e.g., freeways, expressways, city streets, etc.), usually traffic shifts can replace a detour, as detours often congest turn lanes. Provided by Wikipedia