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The highway is a long scenic route that can take you from Del Perro, through North Chumash, and to Paleto. The highway circles half of the map, and can be used to enter Mount Chiliad. Right off the coast of North Chumash, there is a purchasable property near the highway.
The highway may be based on the real-life California State Route 1, which is also a long coastal highway that runs from Los Angeles to Legget, California.