List of Interstate Highways in Utah
The Interstate Highways in Utah are maintained by the Utah Department of Transportation (UDOT). The Interstate Highway System is a nationwide system with only a small portion of these routes entering Utah. Originally, the State Road Commission of Utah, created on March 23, 1909 was responsible for maintenance, but these duties were rolled into the new UDOT in 1975. There are of Interstates within the state. The longest is Interstate 15 (I-15) at and the shortest is I-215 at . One unique former route is Interstate 415, which was never signed as such, and was only used as a temporary designation for the eastern portion of what is now the Interstate 215 belt loop around Salt Lake City.
Historic roads and trails
In the American Old West, the Oregon Trail was a 19th-century pioneer route from Illinois to Oregon. The Santa Fe Trail was a major commercial and military artery from Missouri to Santa Fe, New Mexico.
In modern times, the Lincoln Highway (dedicated 1913) was the first road for the automobile across the United States of America, spanning 3389 miles coast-to-coast from New York City to San Francisco.