High Quality Content by WIKIPEDIA articles! Three numbered highway systems are present in the U.S. state of Utah: the Interstate Highway System, the United States Numbered Highways system (more commonly known as "U.S. Routes") and the state route system. Both the Interstate and U.S. Highway system are nationwide systems with only a small portion of these routes entering Utah. The Utah Department of Transportation is responsible for maintaining all of the Interstate, U.S. Routes and state highways in the state. Originally, the State Road Commission of Utah, created on March 23, 1909 was responsible for maintenance, but these duties were rolled into the new Department of Transportation in 1975.