History
The highway (not an Interstate) that is currently Interstate 215 first opened in 1963 as part of U.S. Route 395. The "mileposts" in Riverside County reflect this, since they do not go to zero at the Interstate 15 interchange in Murrieta. In circa 1968, U.S.395 was renumbered as I-15 (the original proposed route, as CA 71's proposed number was I-15W/CA 31 Hamner-Milliken). This segment of US 395 was again renumbered in 1972 as (Temporary) Interstate 15E. Next in 1982, this route was renumbered as I-215 north of CA 60, and as State Route 215 south of State Route 60. Once State Route 215 was upgraded by construction to Interstate Highway standards, it became part of I-215 in 1994. Prior to its upgrade to Interstate Standards, there were traffic signals at CA 74 junction, as well as at Allesandro (in Moreno Valley); rail road crossing also intersected the expressway at CA 74 .
Due to the fact that the I-215 designation was overlaid upon existing freeways between the southern junction with SR 60 and the city of San Bernardino, the SR 60/SR 91/I-215 interchange in the city of Riverside has been widely known for its confusing nature concerning the numbering of I-215. While SR 60 continues east-and-west through this interchange, and SR 91 continues south (and formerly to the north, the number having now been removed), the I-215 designation continues away from this interchange on SR 60 East and the former northern portion of SR 91 (now solely numbered I-215). Travelers following I-215 in either direction need to "change freeways" at this interchange, instead of just following through lanes. The interchange was recently reconstructed to include some high-speed flyovers, one of which carries I-215 southbound traffic.
Read more about this topic: Interstate 215 (California)
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