California State Route 1

State Route 1
SR 1 highlighted in red
Route information
Maintained by Caltrans
Length	655.845 mi[1] (1,055.480 km) (broken into 5 pieces by U.S. Route 101)
Existed	1934–present
Tourist routes	Route One, Big Sur Coast Highway and Route One, San Luis Obispo North Coast Byway Portions of the Cabrillo Highway in Santa Barbara and San Mateo Counties[4]
Restrictions	Special restrictions[2][3] No flammable or combustible tank vehicles in the Sepulveda Tunnel No trucks with 4 or more axles through Malibu No trucks over 3 short tons (2.7 t) through Lompoc No explosives, flammables or combustibles in the Tom Lantos Tunnels No trucks exceeding 30 feet kingpin to rearmost axle distance from Carmel to San Simeon
Major junctions
South end	I-5 in Dana Point
Major intersections	SR 55 in Newport Beach I-10 in Santa Monica SR 34 in Oxnard SR 46 near Cambria SR 68 in Monterey SR 17 in Santa Cruz SR 92 in Half Moon Bay I-280 in Daly City SR 20 near Fort Bragg
North end	US 101 near Leggett
Location
Country	United States
State	California
Counties	Orange, Los Angeles, Ventura, Santa Barbara, San Luis Obispo, Monterey, Santa Cruz, San Mateo, San Francisco, Marin, Sonoma, Mendocino
Highway system
State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
← I-980 → SR 2

State Route 1 (SR 1) is a major north–south state highway that runs along most of the Pacific coastline of the U.S. state of California. At 656 miles (1,056 km), it is the longest state route in California, and the second-longest in the US after Montana Highway 200. SR 1 has several portions designated as either Pacific Coast Highway (PCH), Cabrillo Highway, Shoreline Highway, or Coast Highway. Its southern terminus is at Interstate 5 (I-5) near Dana Point in Orange County and its northern terminus is at U.S. Route 101 (US 101) near Leggett in Mendocino County. 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.

The highway is designated as an All-American Road. 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.

SR 1 was built piecemeal in various stages, with the first section opening in the Big Sur region in the 1930s. However, portions of the route had several names and numbers over the years as more segments opened. It was not until the 1964 state highway renumbering that the entire route was officially designated as SR 1. Although SR 1 is a popular route for its scenery, frequent landslides and erosion along the coast have caused several segments to be either closed for lengthy periods for repairs, or re-routed inland.