The Interstate Highways in Arizona are the segments of the
Dwight D. Eisenhower System of Interstate and Defense Highways that are owned and maintained by the U.S. state of
Arizona
Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
, totaling about .
Arizona has a total of six Interstate Highways, all of which are mainline highways; there are no auxiliary highways. The longest Interstate in Arizona is
Interstate 10
Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at , following I-90, I-80, and I-40. This freeway is part of the originally pl ...
(I-10), which traverses east-west through the southern and central parts of the state, serving
Phoenix
Phoenix most often refers to:
* Phoenix (mythology), a legendary bird from ancient Greek folklore
* Phoenix, Arizona, a city in the United States
Phoenix may also refer to:
Mythology
Greek mythological figures
* Phoenix (son of Amyntor), a ...
. There are also a total of fourteen active business routes and eight former routes, which were either business loops or spurs for all main highways except
I-15. All of Arizona's existing Interstate Highways have overtaken or replaced some U.S. Routes, which either involved decommissioning or running concurrent with the existing route.
The
Arizona Department of Transportation
The Arizona Department of Transportation (ADOT, pronounced "A-Dot") is an Arizona state government agency charged with facilitating mobility within the state. In addition to managing the state's state highways, highway system, the agency is also i ...
(ADOT) is the agency responsible for building and maintaining the Interstate Highways in the
Arizona State Highway System. These highways are built to
Interstate Highway standards
Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials (AASHTO) in the publication ''A Policy on Design Standards: Interstate System''. For a certain highway to ...
, which are freeways that have a speed limit in rural areas and a speed limit in urban areas.
The numbering scheme used to designate the Interstates was developed by the
(AASHTO), an organization composed of various state departments of transportation in the United States.
Description
The Interstate Highway System currently covers of interstate highway in Arizona, which only consists of
primary highways, which are the two-digit routes and
I-8. There are no
auxiliary interstates within the state, which are three-digit routes. The only auxiliary Interstate that has existed in Arizona was
I-410, which was an inner loop route in Phoenix. It later became part of
I-10
Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at , following I-90, I-80, and I-40. This freeway is part of the originally pl ...
as I-10 was rerouted and the old route became part of
I-17 I17 may also refer to:
* Interstate 17, an intrastate Interstate Highway located entirely within the state of Arizona, United States
* Japanese submarine ''I-17'', a B1 type submarine of the Imperial Japanese Navy
* Polikarpov I-17, a Soviet single ...
. The longest Interstate in Arizona is I-10, which spans
across southern and central Arizona, and the shortest Interstate is I-15, which only traverses the northwestern corner of the state, running from
Nevada
Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
to
Utah
Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...
, spanning only .
I-11 is a proposed Interstate that is currently in its planning phase and is expected to run from the
Hoover Dam
Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on Se ...
to
Nogales. It is planned to overtake
U.S. Route 93 (US 93).
There are also 14 active business routes within the state. All current Interstate Highways have had business routes except for I-15, which never had a business route designated. I-17's only business route located in
Black Canyon City
Black Canyon City is an unincorporated community and census-designated place (CDP) in Yavapai County, Arizona, Yavapai County, Arizona, United States. The population was 2,837 at the 2010 United States Census, 2010 census, up from 2,697 in 2000 ...
was decommissioned in 2011, joining I-15 as the only two routes without a business route.
List
Business routes
All state designated Interstate Business Loops are internally designated as
State Route
A state highway, state road, or state route (and the equivalent provincial highway, provincial road, or provincial route) is usually a road that is either ''numbered'' or ''maintained'' by a sub-national state or province. A road numbered by a ...
Business Loops by ADOT, being referred to throughout ADOT
ArcGIS
ArcGIS is a family of client, server and online geographic information system (GIS) software developed and maintained by Esri. ArcGIS was first released in 1999 and originally was released as ARC/INFO, a command line based GIS system for manipul ...
data and state highway logs as such.
For example, all currently state designated
I-10 Business Loops in Arizona are referred to as "SB010" which is the Arizona Transportation Information System (ATIS) code for "State Business Route 10" or "SR 10B" for short.
See also
*
*
Notes
References
{{reflist
Interstate Highways in Arizona
Interstate
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. Th ...