History
Interstate 15 was constructed along the route of U.S. Route 91. Once Interstate 15 was relatively intact U.S. 91 was decommissioned, except for one part in Northern Utah/Southern Idaho where Interstate 15 instead followed the route of former U.S. Route 191.
Interstate 15 originally had two suffixed routes. In California, Interstate 15 had an eastern branch bypassing San Bernardino, which was designated Interstate 15E. I-15E was renumbered and is now Interstate 215. Present day routing of Interstate 15 in California was originally given "I-15W" as its title while it was under construction (the original asphalt portions from Temescal Canyon to Ontario Street were dubbed I-15W on maps until 1974 ), but was never officially signed as such . In Idaho, I-15 had a western branch near Pocatello that connected I-15 and I-84 (then I-80N). This highway was designated Interstate 15W. It is now the western I-86.
Read more about this topic: Interstate 15
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