U.S. Route 101 Alternate (Santa Monica, California)

State Route 1
Map of California with SR 1 highlighted in red
Route information
Defined by
Maintained by Caltrans
Length:	655.845 mi (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
Restrictions:	Special restrictions' 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
Major junctions
South end:	I-5 in Dana Point
	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 I-280 in Daly City SR 20 near Fort Bragg
North end:	US 101 near Leggett
Highway system
State highways in California Interstate U.S. State Pre-1964 History Unconstructed Deleted Freeway Scenic ← 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 a total of just over 655.8 miles (1,055.4 km), it is the longest state route in California. Highway 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. Highway 101 (US 101) near Leggett in Mendocino County. Highway 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.