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.
U.S. Route 59
From the southwestern suburbs of Houston to Downtown Houston, U.S. 59 is commonly referred to as the "Southwest Freeway," sometimes derisively as the "Southwest's Best Freeway." Supporting 371,000 vehicles per day, it is one of the busiest freeways in the United States. U.S. 59 is known as the "Eastex Freeway" in the north/northeast part of the Houston region. At the Mexico–US border, it ends at the World Trade International Bridge in Laredo, Texas. In Laredo, U.S. 59 is co-signed with both Interstate 69W (I-69W) and Loop 20 and has an intersection with Interstate 35 which ends at the Juarez-Lincoln International Bridge. After crossing the bridge into Mexico, Interstate 35 continues as Mexican Federal Highway 85 in Nuevo Laredo which then runs through Mexico and Central America and ends in Panama at the Panama Canal.