Wikipedia:WikiProject U.S. Roads/California/History/Temporary signage of Interstates

Until many Interstates were completed, the old alignments that had that legislative number were signed as a different route:
 * I-5
 * US 101, Mexico to Los Angeles
 * US 99, San Fernando to Wheeler Ridge
 * US 50, Mossdale to Stockton
 * US 99W, Woodland to Red Bluff
 * US 99, Red Bluff to Oregon


 * I-105
 * SR 42


 * I-205
 * US 50


 * I-505
 * Apparently signed as I-505 despite not being a freeway


 * I-605
 * SR 35??


 * I-8
 * US 80


 * I-10
 * US 60, Beaumont to Arizona


 * I-210
 * Nothing, Newhall Pass to San Fernando
 * SR 118, San Fernando to Pasadena
 * SR 134 in Pasadena?
 * US 66, Pasadena to Glendora


 * I-15
 * US 66, San Bernardino to Barstow
 * US 91, Barstow to Nevada


 * I-40
 * US 66


 * I-80
 * US 40


 * I-580
 * US 50, Oakland to Tracy


 * I-680
 * SR 238, San Jose to Mission San Jose
 * SR 21, Mission San Jose to Cordelia