This section of Pacific Coast Highway was formally dedicated as the 'Theodore Roosevelt Highway' when it was completed in 1929 and was generally known as the 'Roosevelt Highway' or 'Coast Highway' in the 1930s. It was designated as US 101A (Alternate) in 1936. State legislative action in 1964 changed many highway numbers in California, and US 101A became CA 1. In the same year, the state legislature offically named CA 1 'Pacific Coast Highway' in Orange, Los Angeles and Ventura Counties. Photograph caption dated February 2, 1940 reads, "Las Tunas Canyon and and Roosevelt Hiway [sic]. Road covered with 4 & 5 ft. of mud & rock in many places."
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