Detour
A detour or diversion route 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]
On multi-lane highways (e.g. freeways, expressways, city streets, etc.), usually traffic shifts can be utilized in lieu of a detour as turn lanes can often be congested with detours.
[edit] Permanent detours
Various areas have systems of permanent detours as part of incident management.
[edit] Canada
[edit] Ontario
[edit] United Kingdom
The United Kingdom uses yellow signs with a series of symbols for its diversion routes.[3]
[edit] United States
Latin
[edit] Connecticut
Connecticut has two examples of permanent detours.[4]
[edit] Michigan
Michigan has a system of "special route" Emergency routes which parallel major highways.[5][6][7]
[edit] Ohio
Ohio has a permanent detour of Interstate 70 in place because of frequent flooding. [8]
[edit] Pennsylvania
Pennsylvania has a system of "color detour signs" in which any detour follows signs with a specific color.[9][10][11] The detours are meant to be used if a limited-access highway has to be closed for an emergency situation 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][12]
[edit] Wisconsin
Wisconsin has "alternate route designations" in various areas of the state.[13]
[edit] References
- ^ 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. http://pqasb.pqarchiver.com/southbendtribune/access/2327206901.html?FMT=ABS. 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."
- ^ "Direction signs," Signs and markings, Highway Code.
- ^ "Weird Tales," Connecticut Roads.
- ^ "Emergency Interstate 94", "Michiana Road Photos", Roadfan.com.
- ^ Photograph at "US-31 Freeway in Ottawa County", Michigan Highways. See also Bannered routes of U.S. Route 31#Grand Haven, Michigan.
- ^ "I-69 emergency route sign installation starts Jan. 26 (press release)". Michigan Department of Transportation. 2010-01-26. http://www.michigan.gov/mdot/0,1607,7-151-9620_11057-230518--,00.html. Retrieved 2010-02-24.
- ^ I-70 Detour for High Water Event between SR37 and SR79
- ^ Red Detour, Black Detour, Green Detour, Blue Detour: What's It All About? (press release), Pennsylvania Department of Transportation, 2000-10-10.
- ^ a b Carey, Art (January 11, 2008). "PennDot targets tie-ups with color". The Philadelphia Inquirer.
- ^ "Mystery Of New Color-Coded Detour Signs Answered". WCAU-TV. 2008-01-03. http://www.nbc10.com/traffic/14974031/detail.html. Retrieved 2008-07-22.
- ^ Bentman, Hilary (2009-07-06). "Color-coded detour signs popping up all over region". The Intelligencer. http://www.phillyburbs.com/news/local/the_intelligencer/the_intelligencer_news_details/article/27/2009/july/06/color-coded-detour-signs-popping-up-all-over-region.html. Retrieved 2009-07-21.
- ^ "Alternate route designations," State Traffic Operations Center, Wisconsin Department of Transportation.
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