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An official alternate route is a
An official alternate route is a special route
In road transportation in the United States, a special route is a road in a numbered highway system that diverts a specific segment of related traffic away from another road. They are featured in many highway systems; most are found in the ...
in the United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...
that provides an alternate alignment for a highway
A highway is any public or private road or other public way on land. It is used for major roads, but also includes other public roads and public tracks. In some areas of the United States, it is used as an equivalent term to controlled-access ...
. They are loop road
A ring road (also known as circular road, beltline, beltway, circumferential (high)way, loop, bypass or orbital) is a road or a series of connected roads encircling a town, city, or country. The most common purpose of a ring road is to assist i ...
s and found in many road systems in the United States including the U.S. Highway system and various state
State may refer to:
Arts, entertainment, and media Literature
* ''State Magazine'', a monthly magazine published by the U.S. Department of State
* ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States
* '' Our ...
and county
A county is a geographic region of a country used for administrative or other purposes Chambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...
route systems. Alternate routes were created as a means of connecting a town (or towns) desired to be on a route that had been routed differently to put another important town or city on the route, or, in the case of the U.S. Highway system, as a means to eliminate divided routes.
The term "optional route" has also been used. In some cases, an additional business route
A business route (or business loop, business spur, or city route) in the United States is a short special route connected to a ''parent'' numbered highway at its beginning, then routed through the central business district of a nearby city or ...
exists as a third alignment, as with former U.S. Route 71 Alternate, which bypassed Joplin, Missouri
Joplin is a city in Jasper and Newton counties in the southwestern corner of the U.S. state of Missouri. The bulk of the city is in Jasper County, while the southern portion is in Newton County. Joplin is the largest city located within both Jasp ...
.
AASHTO defines and specifies that alternate routes of the US 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.Special Route DefinitionsIn at least one case, the banner "Optional Route" was retained when a second alternate route existed. One example 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: "US 69A" means "US 69 Alternate".
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See also
* * List of business routes of the Interstate Highway System * Bypass (road) *List of special routes of the United States Numbered Highway System
A special route of the United States Numbered Highway System is a route that branches off a U.S. Highway in order to divert traffic from the main highway. Special routes are distinguished from main routes by, in most cases, the addition of a ...
References
External links
{{US route types Roads in the United States Types of roads