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The Interstate Highways in Texas are all owned and maintained by the U.S. state of Texas. The Texas Department of Transportation (TxDOT) is the agency responsible for the day-to-day maintenance and operations of the Interstate Highways in Texas. The Interstate Highway System in Texas covers and consists of eleven primary routes, seven auxiliary routes and Interstate 35 (I-35) which is split into two branches, I-35E and I-35W, that provide access to both Fort Worth and Dallas. The longest segment of Interstate Highway in Texas is I-10 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 and Houston 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, 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 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 southward from its current terminus in Indiana through Texas to the United States–Mexico border. If complete as planned, I-69 will extend about across Texas, from the Louisiana state line in the Texarkana-Shreveport 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|I-10 and I-35 run concurrently as an elevated freeway in Downtown San Antonio|alt=Photograph File:FTWORTHTX3224.JPG|I-20 in southern Fort Worth|alt=Photograph File:I-37, I-410 interchange, San Antonio, Texas.JPG| I-37 and I-410 interchange on the southeast side of San Antonio|alt=Photograp File:I-37 - US 77 interchange.jpg|Interchange between I-37 and I-69E/US 77|alt=Photograph File:45intoI-10 2.jpg| I-10 and I-45 near Downtown Houston|alt=Aerial photograph 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Interstate Highways in Texas」の詳細全文を読む スポンサード リンク
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