SR 1 is part of the California Freeway and Expressway System, and through the Los Angeles metro area, Monterey, Santa Cruz, San Francisco metro area, and Leggett is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. Although SR 1 is a popular route for its scenic beauty, frequent landslides and erosion along the coast have caused several segments to be either closed for lengthy periods for repairs, or re-routed inland. It was not until the 1964 state highway renumbering that the entire route was officially designated as SR 1.
However, portions of the route had several names and numbers over the years as more segments opened. SR 1 was built piecemeal in various stages, with the first section opening in the Big Sur region in the 1930s. In addition to providing a scenic route to numerous attractions along the coast, the route also serves as a major thoroughfare in the Greater Los Angeles Area, the San Francisco Bay Area, and several other coastal urban areas. The highway is designated as an All-American Road. SR 1 also at times runs concurrently with US 101, most notably through a 54-mile (87 km) stretch in Ventura and Santa Barbara counties, and across the Golden Gate Bridge. Route 101 (US 101) near Leggett in Mendocino County.
Its southern terminus is at Interstate 5 (I-5) near Dana Point in Orange County and its northern terminus is at U.S. SR 1 has several portions designated as either Pacific Coast Highway ( PCH), Cabrillo Highway, Shoreline Highway, or Coast Highway. At a total of just over 656 miles (1,056 km), it is the longest state route in California. State Route 1 ( SR 1) is a major north–south state highway that runs along most of the Pacific coastline of the U.S.
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