The Ridge Route was the first automobile highway linking the Central Valley with the Los Angeles Basin. It was laid in a sinuous fashion through the ridges and gullies of the Sierra Pelona Mountains to the Tejon Pass around 1910. The northern portion of this highway, which became a part of U.S. Route 99, was known as The Grapevine. The Ridge Route was replaced by a three-lane alternate highway in 1933, a four-lane expressway in 1947, and later by the eight-lane Interstate 5 Freeway in 1970.