California Streets and Highways Code Sec. § 312 Route 12 is from: (a) Route 1 near Valley Ford to Route 121 near Sonoma via Santa Rosa. (b) Route 29 in the vicinity of Napa to Route 80 near Cordelia. (c) Route 80 near Fairfield to Route 99 near Lodi via Rio Vista. (d) Route 99 near Lodi to Route 88 near Lockeford. (e) Route 88 near Clements to Route 49 near San Andreas.