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.
Yonge Street
Yonge Street was formerly a part of Highway 11, which led to claims that Yonge Street was the longest street in the world. Running (mostly) concurrent with Yonge as far north as Barrie, then continuing beyond through central and northern Ontario to the Ontario-Minnesota border at Rainy River, the highway was over long. But Yonge Street could only be called the longest street in the world if were fully synonymous with Highway 11, which has never been the case.