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.
Mexican Federal Highway 180
Highway 180 connects at the Mexico–United States border with U.S. Route 83, one of the longest north-south U.S. Highways in the United States at . Federal Highway 180 also connects to both Interstate 69E and U.S. Route 77 at the border. U.S. Route 83 (along with both Interstate 69E and U.S. Route 77) starts the northern terminus of Highway 180 in Brownsville, Texas, at the Veterans International Bridge on the Mexican border. After crossing the bridge into the United States, Federal Highway 180 continues as U.S. Route 83 in Brownsville which then runs northward to the U.S. highway's northern terminus, north of Westhope, North Dakota, at the Canada–United States border. From here, the highway continues further as Manitoba Highway 83 until it ends at Swan River, Manitoba. In total, the three highways total in length.