Area also use this route to head to Tehachapi Pass to head to Interstate 40, the Antelope Valley, Las Vegas, and Mount Whitney if they do not want to use I-5. Once it enters the San Joaquin Valley, SR 46, known as the Paso Robles Highway, follows an almost perfectly straight eastward alignment, crossing SR 33 at Blackwells Corner, passing through the Lost Hills Oil Field, and intersecting I-5 about past Lost Hills and the crossing of the California Aqueduct. SR 46 then passes through the Semitropic Oil Field about west of Wasco. SR 46 and SR 43 overlap for a short distance in the city of Wasco, and then SR 46 passes over Calloway Canal and Friant Canal before it ends at SR 99 in Famoso. The county-maintained Famoso Road continues east across SR 65 and into the Sierra Nevada foothills. East of Paso Robles, SR 46 is part of the California Freeway and Expressway System, and east of US 101 is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. The highway from SR 1 to SR 41 near Cholame is an eligible State Scenic Highway, but it is not officially designated as a scenic highway by the California Department of Transportation. History As part of the second state highway bond issue, approved by the state's voters in 1916, Route 33 was created, linking the San Joaquin Valley trunk (Route 4, now SR 99) near Bakersfield with the coast trunk (Route 2, now US 101 in Paso Robles, passing through the Coast Ranges via Cholame Pass. The road was not yet built in 1919 when the Automobile Blue Book recommended only the county-maintained "very poor road" (now SR 58) via Simmler as a connection between the valley and Central Coast. By 1925, the Cholame Pass highway had been improved, and paving was completed in December 1930. An extension west to Route 56 (now SR 1) near Cambria was added in 1933; however, it ran along Santa Rosa Creek Road, north of today's alignment. The state sign route system was established in 1934 but the majority of Route 33 did not receive a state route designation, instead becoming part of the new U.S. Route 466. However, US 466 turned southwest from Cholame Pass along Legislative Route 125 (modern SR 41) to Morro