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When Southern California freeways were built in the 1940s and early 1950s, local common usage was primarily the freeway name preceded by the definite article. [19] It took several decades for Southern California locals to start to also commonly refer to the freeways with the numerical designations, but the usage of the definite article persisted.
The state highway system of the U.S. state of California is a network of highways that are owned and maintained by the California Department of Transportation (Caltrans). Each highway is assigned a Route (officially State Highway Route [ 1 ] [ 2 ] ) number in the Streets and Highways Code (Sections 300–635) .
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. [1] 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 ...
A few cases exist, such as SR 110, where a defined California State Route partially overlaps with a federally defined Interstate Highway, while the remaining portion is signed as a state highway. This table only addresses the portion signed as a California State Route in these cases.
There is a part of Route 710 in Pasadena that is constructed to freeway standards, extending from California Boulevard north to the Foothill (I-210)/Ventura (SR 134) freeway interchange. However, the route designation on this freeway stub is unsigned, and is instead marked as if it were merely freeway entrance and exit ramps to and from I-210.
I-105 was an integral part of a Caltrans 1960s master plan for the Southern California freeway system, but did not open until 1993. The right-of-way was included on several early highway plans since at least 1947, although it was not named the "Century Freeway" until 1956, and was numbered Route 42.
SR 18 is part of the California Freeway and Expressway System, [3] and in Apple Valley and west of I-15 are part of the National Highway System, [4] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. [5]
SR 65 is part of the California Freeway and Expressway System; [2] the southern segment as well as the northern segment in Roseville and near Yuba City are part of the National Highway System, [3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. [4]