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.
Missouri Route 5
Missouri Route 5 is the longest state highway in Missouri and the only Missouri state highway to traverse the entire state. It is part of a three state, 650 mile highway 5. To the north, it continues into Iowa as Iowa Highway 5 and to the south it enters Arkansas as Highway 5. With only a few exceptions, it is two-lane for its entire length. Business Route 5 serves Milan and Ava.