Alternate route

Types of special routes in the United States

An official alternate route is a special route in the United States that provides an alternate alignment for a highway. They are loop roads and found in many road systems in the United States including the U.S. Highway system and various state and county route systems. Alternate routes were created as a means of connecting a town (or towns) desired to be on a route which had been routed differently so as to put another important town or city on the route.

Originally, the term for these routes was "optional"; but in 1959, the American Association of State Highway and Transportation Officials (AASHTO) changed the designation to "alternate". In some cases where needed, an additional business route exists as a third alignment (this was the case with former U.S. Route 71 Alternate, which bypassed Joplin, Missouri).

AASHTO defines and specifies that alternate routes of the U.S. Route system should have the following behavior:

An "Alternate Route" shall be considered a route which starts at a point where it branches off from the main numbered route, may pass through certain cities and towns, and then connect back with the regular route some miles distant. Since it is the purpose of the U.S. numbered system to mark the best and shortest route available, an alternate route should be designated only where both routes are needed to accommodate the traffic demand, and when the alternate route has substantially the same geometric and structural design standards of the main marked routing. It is recommended that in case an alternate route is marked, that the shorter and better constructed route be given the regular number and the other section designated as the "Alternate Route". It is further recommended that the Highway Department erect signs at the junction points of the regular and alternate routes giving the distance between the cities or points concerned... In no instance should an alternate routing be used for the purpose of keeping an obsolete section on the U.S. numbered system after a new routing has been constructed and available to traffic.^[1]

In at least one case, the banner "Optional Route" was retained when a second alternate route existed. One example of this occurred in Kansas City, Missouri with U.S. Route 40 which had an alternate and an optional route simultaneously.

In some US states, an alternate route will be designated by adding an "A" after the number instead of a sign marked "Alternate" above it. Example: "US 69A" means "US 69 Alternate".

References

↑ Special Route Definitions

External links

Route designations in the United States

Multistate systems	Interstate Auxiliary Business U.S. Highway

Intrastate systems	Toll road State highway County highway Farm-to-market road

State- and district- specific types	District of Columbia route Missouri supplemental route Montana secondary route Nebraska Connecting Link, Spur, and Recreation routes New York State Parkway Pennsylvania quadrant route Tennessee secondary route Texas Loop, Spur, Park, Recreation, and Beltway routes

Special route types	Alternate route Business/city route Bypass route Connector route Divided route Emergency detour route Loop route Scenic route Spur route

Street types	Numbered street

Other	U.S. Bicycle Route Forest highway Indian route Territorial highway

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Alternate route

See also

References

External links