__NOTOC__ A detour is a route around a planned area of prohibited or reduced access, such as a construction site. [1] Standard operating procedure for many road departments is to route any detour over roads within the same jurisdiction as the road with the obstructed area. [2]

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Permanent detours

Various areas have systems of permanent detours as part of incident management.

Canada

Ontario

United Kingdom

The United Kingdom uses yellow signs with a series of symbols for its "diversion routes." ^[3]

United States

Connecticut

Connecticut has two examples of permanent detours. ^[4]

Michigan

Michigan has a system of "special route" Emergency routes which parallel major highways. ^{[5] [6]}

Pennsylvania

Pennsylvania has a system of "color detour signs" in which any detour follows signs with a specific color. ^{[7] [8] [9]} The detours are meant to be used if a limited-access highway has to be closed for an emergency situtation such as a flood or car accident, directing motorists along local roads near the limited-access highway to the next exit. They are generally color-coded according to direction, with blue meaning north, red meaning south, green meaning east, and orange meaning west. However, other colors, such as black and brown, are sometimes used when detour routes overlap with one another. ^[10]

Wisconsin

Wisconsin has "alternate route designations" in various areas of the state. ^[11]

References

1. U.S. Manual on Uniform Traffic Control Devices Section 6C.09
2. Example: Section 602.6, Traffic Engineering Manual, Ohio Department of Transportation.
3. "Direction signs," ''Signs and markings'', Highway Code.
4. "Weird Tales," ''Connecticut Roads''.
5. "Emergency Interstate 94", "Michiana Road Photos", ''Roadfan.com''.
6. Photograph at "US-31 Freeway in Ottawa County", ''Michigan Highways''. See also Bannered routes of U.S. Route 31#Grand Haven, Michigan.
7. Red Detour, Black Detour, Green Detour, Blue Detour: What's It All About? (press release), Pennsylvania Department of Transportation, 2000-10-10.
8. PennDot targets tie-ups with color
9. Mystery Of New Color-Coded Detour Signs Answered
10. Color-coded detour signs popping up all over region
11. "Alternate route designations," State Traffic Operations Center, Wisconsin Department of Transportation.