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The San Diego Freeway is one of the named principal Southern California freeways. It consists of the following two segments:

Interstate 5, from California State Route 94 in San Diego to Interstate 405 (El Toro Y) in Irvine^[1]
Interstate 405, in its entirety from Interstate 5 in Irvine to Interstate 5 near San Fernando

^ "2012 Named Freeways, Highways, Structures and Other Appurtenances in California" (PDF). California Department of Transportation. Retrieved April 28, 2013.