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.
Pan-American Highway (North America)
The Pan-American Highway unofficially begins in Prudhoe Bay, Alaska near Deadhorse. Traveling south to Fairbanks, Alaska, the Highway follows the length of the Dalton Highway (Alaska Route 11) and Alaska Route 2. (Dalton Highway was the subject of the BBC's first episode of "World's Most Dangerous Roads".) From Fairbanks, Alaska's third largest city, the Pan-American Highway and the Alaska Highway are one and the same, following Alaska Route 2 southeast to the Canada–United States border southeast of Northway, Alaska, and adjacent to the Tetlin National Wildlife Refuge.