A detour or diversion route is a route around a planned 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.
Permanently signed detour routes 
to take a different route or path
- U.S. Manual on Uniform Traffic Control Devices Section 6C.09
- Example: Dits, Joseph (2011-04-19). "Capital Ave. to be closed at railroad tracks in Mishawaka for a week" (fee required). South Bend Tribune. Retrieved 2011-04-20. "The state will erect signs that take car traffic on a detour all the way through downtown South Bend – a longer detour than local residents could figure out – because the state has to use state roads, said InDOT spokesman Jim Pinkerton."
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