The California Freeway and Expressway System is a system of existing or planned freeways and expressways in the U.S. state of California. It encompasses both State highways and federal highways in California. It was defined by Article 2 (commencing with section 250) of Chapter 2 of Division 1 of the Streets and Highways Code. in 1959. List of roads in the system The following is a list of roads defined by the Streets and Highways Code, sections 250–257, as part of the California Freeway and Expressway System. Some of the routes listed may still be in the planning stages of being fully upgraded to freeways or expressways. State Route 1 (part) State Route 2 (part) State Route 3 (part) State Route 4 (part) Interstate 5 U.S. Route 6 State Route 7 Interstate 8 State Route 9 Interstate 10 State Route 11 State Route 12 State Route 13 (part) State Route 14 Interstate 15 and State Route 15 State Route 16 (part) State Route 17 (part) State Route 18 State Route 19 State Route 20 (part) State Route 22 (part) State Route 23 (part) State Route 24 State Route 25 (part) State Route 26 (part) State Route 27 State Route 28 State Route 29 State Route 32 State Route 33 (part) State Route 34 State Route 35 (part) State Route 36 (part) State Route 37 State Route 38 (part) State Route 39 (part) Interstate 40 State Route 41 (part) State Route 43 (part) State Route 44 State Route 45 (part) State Route 46 (part) State Route 47 State Route 48 State Route 49 (part) U.S. Route 50 State Route 51 (signed as Interstate 80 Business in Sacramento) State Route 52 State Route 53 State Route 54 State Route 55 State Route 56 State Route 57 State Route 58 (part) State Route 59 State Route 60 State Route 61 State Route 62 (part) State Route 63 State Route 65 State Route 66 State Route 67 State Route 68 State Route 70 State Route 71 State Route 72 State Route 73 State Route 74 State Route 75 State Route 76 (part) State Route 77 (part) State Route 78 State Route 79 (part) Interstate 80 State Route 81 State Route 82 State Route 83 State Route 84 (part) State Route 85 State Route 86 State Route 87 State Route 88 State Route 89 State Route 90 State Route 91 (part) State Route 92 (part)