State Route 1 (SR 1), often called Highway 1, is a state highway that runs along much of the Pacific coast of the U.S. state of California. It is famous for running by some of the most beautiful coastlines in the world, leading to its designation as an All-American Road.

SR 1 starts at Interstate 5 in the Orange County area before traveling along the western edge of Los Angeles and passing through the seaside towns of Santa Monica and Malibu. The highway continues north, at times running concurrently with U.S. Route 101 (US 101), and serves as a scenic alternative to US 101 in several locations. SR 1 connects Ventura, San Luis Obispo, San Simeon (where Hearst Castle is located), Monterey, and Santa Cruz.

Following this, SR 1 enters the metropolitan area and later the city proper of San Francisco, crossing the Golden Gate Bridge and continuing through Marin County. The highway provides access to Point Reyes National Seashore and Fort Bragg before reaching its northern terminus at U.S. Route 101 in Leggett.

SR 1 has several portions designated as either Pacific Coast Highway (commonly abbreviated PCH), the Cabrillo Highway, or the Shoreline Highway.

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