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A permanently-signed detour route is a type of [[special route]]. Various areas have developed these systems as part of [[incident management]]. The purpose of these routes is to offer an alternative in the event that the parent route is impassable, due to either a [[traffic jam]]s, [[traffic collision]], or road closure (for a variety of reasons).
A permanently-signed detour route is a type of [[special route]]. Various areas have developed these systems as part of [[incident management]]. The purpose of these routes is to provide a [[detour]] in the event that the parent route is impassable, due to either a [[traffic jam]]s, [[traffic collision]], or road closure (for a variety of reasons).


==Canada==
==Canada==

Revision as of 14:52, 3 August 2012

A permanently-signed detour route is a type of special route. Various areas have developed these systems as part of incident management. The purpose of these routes is to provide a detour in the event that the parent route is impassable, due to either a traffic jams, traffic collision, or road closure (for a variety of reasons).

Canada

Ontario

Ontario, Canada is one jurisdiction outside the United States with a very prevalent system of these roads.

United Kingdom

The United Kingdom uses yellow signs with a series of symbols for its diversion routes.[1]

United States

Michigan

Emergency plate
Emergency I-94 shields in Coloma, Michigan

Michigan has a system of special routes called "Emergency" routes which parallel major highways, primarily in Southwestern Michigan. These routes provide relief in the event of emergency closures to a freeway due to accidents, weather, or other civil emergencies. Emergency routes have been gradually put in place as part of a broader plan by the Michigan Department of Transportation to upgrade its ITS network across the state. These detours may or may not follow MDOT-maintained State Highways, however, and some portions of the routes pass through urban or suburban areas.[2] Emergency routes exist on and parallel to Interstate Highways 69[3] and 94[2] and U.S. Route 31.[4]

These routes are signed with an auxiliary "Emergency" banner that is colored orange, indicating a temporary traffic control sign.

Emergency U.S. Route 31, which offers an alternative crossing of the Grand River in the event that the bascule bridge in Grand Haven, Michigan is unavailable for motorists,[5] is one such route. According to the Michigan Department of Transportation, "This route would only be used in emergency situations and worst-case scenarios impacting the entire bridge structure."[5] Emergency Interstate 94 follows Interstate 94 throughout much of southern Michigan.[6]

Ohio

Ohio has established a permanent detour scenario of Interstate 70, due to frequent flooding. [7]

Pennsylvania

Green and orange detour signs in Pennsylvania

Pennsylvania has a system of "color detour signs" in which any detour follows signs with a specific color.[8][9][10] 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 black meaning west. However, other colors, such as orange and brown, are sometimes used when detour routes overlap with one another.[9][11]

Wisconsin

Wisconsin has "alternate route designations" in various areas of the state.[12]

References

  1. ^ "Direction signs," Signs and markings, Highway Code.
  2. ^ a b "Southwest Region and Portions of University Region Final Regional ITS Deployment Plan (part 2)" (PDF). Michigan Department of Transportation. 2008-01-24. {{cite web}}: Unknown parameter |access= ignored (|access-date= suggested) (help)
  3. ^ "I-69 emergency route sign installation starts Jan. 26 (press release)". Michigan Department of Transportation. 2010-01-26. Retrieved 2010-02-24.
  4. ^ "MDOT installs new emergency signs on US-31 (press release)". Michigan Department of Transportation. 2009-03-11. Retrieved 2012-07-22.
  5. ^ a b MDOT - MDOT establishes US-31/Bascule Bridge emergency detour routes
  6. ^ "Emergency Interstate 94", "Michiana Road Photos", Roadfan.com.
  7. ^ I-70 Detour for High Water Event between SR37 and SR79
  8. ^ Red Detour, Black Detour, Green Detour, Blue Detour: What's It All About? (press release), Pennsylvania Department of Transportation, 2000-10-10.
  9. ^ a b Carey, Art (January 11, 2008). "PennDot targets tie-ups with color". The Philadelphia Inquirer. {{cite news}}: Cite has empty unknown parameter: |coauthors= (help)
  10. ^ "Mystery Of New Color-Coded Detour Signs Answered". WCAU-TV. 2008-01-03. Retrieved 2008-07-22. {{cite news}}: Cite has empty unknown parameter: |coauthors= (help)
  11. ^ "PennDOT Detour Signs (flyer released by [[Chester County, Pennsylvania]] website)" (PDF). Pennsylvania Department of Transportation. Retrieved 2012-07-22. {{cite web}}: URL–wikilink conflict (help)
  12. ^ "Alternate route designations," State Traffic Operations Center, Wisconsin Department of Transportation.