Interstate 21 (I-21) is an Interstate Highway in the western United States. The southern terminus is in Canyon Springs, Arizona at Interstate 40 (I-40). The northern terminus is in Osario, Nevada at Interstate 80 (I-80). I-21 is only in the U.S. states of Arizona and Nevada. I-21 is mostly parallel to its "brother route" and is the "sister route" of Interstate 23 (I-23) in the southern portion of the interstate. The largest metropolitan area I-21 connects to is Highway City, where it serves Intertropolis in Nevada, while I-23 serves Routeville in Utah. I-21 intersects I-48 at an interchange called the Intertropolis Interchange.
Near the Nevada state line, I-21 runs concurrently with Interstate 515, Interstate 11, U.S. 93 & U.S. 95, near the end of I-11 and I-515, I-21, U.S. 93 & U.S. 95 run concurrently with Interstate 15 until U.S. 95 splits from U.S. 93, I-15 & I-21 to continue north towards Tonopah, the 3 highways run concurrently until I-15 splits from I-21 & U.S. 93 to Continue North towards Salt Lake City, after leaving Las Vegas, I-21 heads north with U.S. 93 for 86 miles before Splitting from U.S. 93 to continue north to Intertropolis (Highway City)
Intertropolis, Nevada (Highway City)[]
Map of Highway City.
Main article: Jordan Cassatt Highway
In Highway City, I-21 is locally known as Jordan Cassatt Highway. It serves as the main north-south expressway in Intertropolis, the western city of the metropolitan area of Highway City, and west of the Town Separator.
