According to Wikipedia," State Route 1, more 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 along some of the most beautiful coastlines in the world, leading to its designation as an All-American Road.
Highway 1 does not cover the entire Pacific coastline of California from the Mexican border to Oregon. Rather, it starts at Interstate 5 (I-5) near Dana Point in Orange County and runs north to U.S. Highway 101 (U.S. 101) near Leggett in Mendocino County. Highway 1 also at times runs concurrently with U.S. 101, most notably through a 54-mile (87 km) stretch in Ventura and Santa Barbara Counties, and across the Golden Gate Bridge. It also serves as a scenic alternative in several locations; and a major thoroughfare in the Greater Los Angeles Area, the San Francisco Bay Area, and other coastal urban areas along its route.
Highway 1 has several portions designated as either P Coast Highway (PCH), the Cabrillo Highway,
the Shoreline Highway, or the Coast Highway. It is also
part of the larger Pacific Coastal Highway that
extends along the Pacific coast of the entire Americas."
To read the full article from Wikipedia Pacific Coast Highway Click Here.