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.
North America
The Pan-American Highway route in the Americas is the portion of a network of roads nearly in length which travels through the mainland nations. No definitive length of the Pan-American Highway exists because the US and Canadian governments have never officially defined any specific routes as being part of the Pan-American Highway, and Mexico officially has many branches connecting to the US border. However, the total length of the portion from Mexico to the northern extremity of the highway is roughly .