California State Route 46
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California State Route 46, is an east-west highway from the Pacific coast of California at Cambria, California through the western part of the southern San Joaquin Valley, intersecting California State Highway 99 about five miles east of Wasco It has an interchange with Interstate 5 near Lost Hills.
Between Paso Robles (junction U.S. Highway 101) and its eastern terminus on California 99, or most of its route, it is the former U.S. Highway 466 and is one of the easiest crossings of the Coast Range between San Francisco and Los Angeles. The segment between Cambria and Paso Robles was never part of US-466. and was not a state highway until US 466 was decommissioned; parts of that segment were unpaved until the 1970s.
Aside from a short segment coinciding with US 101, all of CA-46 is surface highway. The road has some notoriety as the highway upon which the promising young film star James Dean died in a freakish traffic accident in 1955.