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.
U.S. Route 1
U.S. Route 1 (US 1) is a major north–south U.S. Highway that serves the East Coast of the United States. It runs , from Key West, Florida north to Fort Kent, Maine, at the Canada–US border, making it the longest north–south road in the United States. US 1 is generally paralleled by I-95, though the former is significantly farther west (inland) between Jacksonville, Florida, and Petersburg, Virginia. The highway connects most of the major cities of the East Coast—including Miami, Jacksonville, Richmond, Washington, D.C., Baltimore, Philadelphia, New York City, Boston and Portland, passing from the Southeastern United States to New England.