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.
List of state roads in New Mexico
State roads in New Mexico, along with the Interstate Highway System, and the United States Numbered Highways, fall under the jurisdiction of the New Mexico Department of Transportation. The U.S. state of New Mexico has 412 state roads, totaling that criss-cross the 33 counties of the state. The longest state road, New Mexico State Road 120 (NM 120), measures long, while the shortest, NM 446, measures long. Most highway numbers are one, two, or three digits long, however there are three highways that have four digit highway numbers. These highways are NM 1113, NM 5001, and NM 6563.