When the Arroyo Seco Parkway opened, it became a new alignment of U.S. Route 66, and the old routing via Figueroa Street and Colorado Boulevard became U.S. Route 66 Alternate.
When the Arroyo Seco Parkway opened, it was the first freeway in California and the western United States. It became a new alignment of U.S. Route 66, and the old routing via Figueroa Street and Colorado Boulevard became U.S. Route 66 Alternate.