Special routes of U.S. Route 66
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There have been 22 special routes of U.S. Route 66 (US 66). These special routes included alternate routes, business loops and bypass routes in four states along the route of the former US 66.
California
Los Angeles alternate route
Alternate U.S. Route 66 was a designation to preserve the next-to-last routing of US 66 from Pasadena to Los Angeles, California, when the signage for US 66 was transferred to the Arroyo Seco Parkway (also known as the Pasadena Freeway, which alignment lasted from 1938 to 1964, when Alternate US 66 was eliminated as well as Historic Arroyo Seco Parkway into SR 11, and became SR 110 in 1981.
The routing from Pasadena to Los Angeles was west on Colorado Boulevard and then south on Figueroa Street. The end of the Pasadena Freeway then blended into Figueroa Street, and the alternate route rejoined its parent route. The routing along Figueroa Street and the portion along Colorado Boulevard between Linda Vista Avenue and Figueroa Street also bore the designation of State Route 11.
San Bernardino business loop
Business US 66 in San Bernardino, sometimes rendered "City" US 66 on contemporary maps, was a short business loop that existed in the city from the late 1940s until US 66 was decommissioned in California in 1964. Designated as Legislative Route Number 191, its former alignment continued east from the junction of US 66, former US 91 and former US 395 at Mount Vernon Avenue and 5th St, east along 5th Street and then north on E Street. E Street continued on to become modern Kendall Drive, rejoining the US 66 mainline at Cajon Boulevard near Devore. Part of this routing included the former alignment of State Route 18 prior to its truncation.
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