The Interstate Highways in Texas are all owned and maintained by the U.S. state of

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

. The

Texas Department of Transportation The Texas Department of Transportation (TxDOT ) is a government agency in the American state of Texas. Though the public face of the agency is generally associated with the construction and maintenance of the state's immense state highway syst ...

(TxDOT) is the agency responsible for the day-to-day maintenance and operations of the

Interstate Highways 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. T ...

in Texas. The Interstate Highway System in Texas covers and consists of twelve primary routes, seven

auxiliary routes 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 I ...

and

Interstate 35 Interstate 35 (I-35) is a major Interstate Highway in the central United States. As with most primary Interstates that end in a five, it is a major cross-country, north–south route. It stretches from Laredo, Texas, near the Mexican border ...

(I-35) which is split into two branches,

I-35E Interstate 35E may refer to: *Interstate 35E (Texas), a long branch route serving Dallas, Texas *Interstate 35E (Minnesota), a long branch route serving St. Paul, Minnesota See also * Interstate 35W (disambiguation) Interstate 35W may refer to: * ...

and I-35W, that provide access to both Fort Worth and

Dallas Dallas () is the List of municipalities in Texas, third largest city in Texas and the largest city in the Dallas–Fort Worth metroplex, the List of metropolitan statistical areas, fourth-largest metropolitan area in the United States at 7.5 ...

. The longest segment of Interstate Highway in Texas is

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 p ...

at ; the shortest is I-110 at . The construction of the Interstate Highway System in Texas began well before these routes were designated as Interstate Highways. A stretch of I-45 between

Galveston Galveston ( ) is a coastal resort city and port off the Southeast Texas coast on Galveston Island and Pelican Island in the U.S. state of Texas. The community of , with a population of 47,743 in 2010, is the county seat of surrounding Gal ...

and

Houston Houston (; ) is the List of cities in Texas by population, most populous city in Texas, the Southern United States#Major cities, most populous city in the Southern United States, the List of United States cities by population, fourth-most pop ...

was opened in 1951, eight years before it was designated I-45. It was also the first urban expressway in Texas. In 1962, of I-35 opened in

Bexar County Bexar County ( or ; es, Béxar ) is a county in the U.S. state of Texas. It is in South Texas and its county seat is San Antonio. As of the 2020 census, the population was 2,009,324. Bexar County is included in the San Antonio– New Bra ...

, the first section of Interstate Highway to open from county line to county line in a large metropolitan area. Portions of I-10 west of

San Antonio ("Cradle of Freedom") , image_map = , mapsize = 220px , map_caption = Interactive map of San Antonio , subdivision_type = Country , subdivision_name = United States , subdivision_type1= State , subdivision_name1 = Texas , subdivision_t ...

took much longer to complete due to the vast open spaces and lack of nearby labor. The majority of the construction of this section of I-10 occurred in the 1970s and 1980s and was complete by the early 1990s. The section east of San Antonio was completed 20 years earlier in 1972. The opening of a section of I-27 in 1992 completed the Interstate Highway System in Texas. Planning is ongoing for a proposed extension of

I-69 Interstate 69 (I-69) is an Interstate Highway in the United States currently consisting of 10 unconnected segments with an original continuous segment from Indianapolis, Indiana, northeast to the Canadian border in Port Huron, Michigan, a ...

southward from its original terminus in

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th ...

through Texas to the

United States–Mexico border United may refer to: Places * United, Pennsylvania, an unincorporated community * United, West Virginia, an unincorporated community Arts and entertainment Films * ''United'' (2003 film), a Norwegian film * ''United'' (2011 film), a BBC Two f ...

. If complete as planned, I-69 will extend about across Texas, from the

Louisiana Louisiana , group=pronunciation (French: ''La Louisiane'') is a U.S. state, state in the Deep South and South Central United States, South Central regions of the United States. It is the List of U.S. states and territories by area, 20th-smal ...

state line in the Texarkana–

Shreveport Shreveport ( ) is a city in the U.S. state of Louisiana. It is the third most populous city in Louisiana after New Orleans and Baton Rouge, respectively. The Shreveport–Bossier City metropolitan area, with a population of 393,406 in 2020, is t ...

area to South Texas. The first portion was approved in 2011, with signage posted December 6, 2011.

Primary Interstate Highways

File:Downtown San Antonio.jpg, alt=Photograph, I-10 and I-35 run concurrently as an elevated freeway in

Downtown San Antonio Downtown San Antonio is the central business district of San Antonio, Texas, United States. It also serves as the urban core of Greater San Antonio, a metropolitan area with nearly 2.5 million people. In addition to being encircled by Loops 1604 ...

File:FTWORTHTX3224.JPG, alt=Photograph, I-20 in southern Fort Worth File:I-37, I-410 interchange, San Antonio, Texas.JPG, alt=Photograph, I-37 and I-410 interchange on the southeast side of San Antonio File:I-37 - US 77 interchange.jpg, alt=Photograph, Interchange between I-37 and I-69E/US 77 File:45intoI-10 2.jpg, alt=Aerial photograph, I-10/US 90 and I-45 near

Downtown Houston Downtown is the largest central business district in the city of Houston and the largest in the state of Texas, located near the geographic center of the metropolitan area at the confluence of Interstate 10, Interstate 45, and Interstate 69. The ...

Auxiliary Interstate Highways

File:Houston, TX - IH610 US290 - exit12 w18th st - Hempstead rd.jpg, alt=Photograph, I-610 at US 290 in Houston File:High Five Interchange.jpg, alt=Photograph, The

High Five Interchange The High Five Interchange is one of the first five-level stack interchanges built in Dallas, Texas. Located at the junction of the Lyndon B. Johnson Freeway ( Interstate 635, I-635) and the Central Expressway ( US Highway 75, US ...

at I-635 and

US 75 U.S. Route 75 is a major north–south U.S. Highway that extends in the central United States. The highway's northern terminus is in Noyes, Minnesota, at the Canadian border, where it once continued as Manitoba Highway 75 on the other si ...

in Dallas

Business Interstate Highways

File:Van horn texas.jpg, alt=Photograph, Bus. I-10-D in Van Horn File:Downtown Pearsall, TX IMG 0480.JPG, alt=Photograph, Bus. I-35-E in Pearsall

Notes

References

External links

Texas Department of TransportationTexas Highway Man
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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. T ...