"Keep it fine at 99" from Bakersfield or starting at the Ridge Route north of L.A. of Sylmar to the inland ports of Stockton or Lodi, south of Sacramento. I don't know about another interstate from Sac. Airport to Red Bluff or Redding, despite the growth around Chico and Yuba City/Marysville in a relatively lesser populated region.
To further add the I-7 and I-9 (and I believe I-11) were once proposed highway routes for the San Diego area, Imperial and Indio/Coachella valleys, except they are now Cal. routes 7, 78, 86, 111 and I-905 in San Ysidro from I-5 to the Mexican border port entry/Otay Mesa state prison.
Interstate-11 is now for a proposed freeway from either Reno, Nevada or Las Vegas to Kingman, Arizona or Phoenix.