 Special routes of U.S. Route 66

There have been 22 special routes of U.S. Route 66.Alternate U.S. Route 66 was a designation to preserve the next-to-last routing of U.S. 66 from Pasadena, California to Los Angeles, California, when the signage for U.S. 66 was transferred to the Arroyo Seco Parkway (also known as the Pasadena Freeway, with alignment lasted from 1938 to 1964, when Alternate U.S. 66 was eliminated as well as Historic Arroyo Seco Parkway into SR 11, and became SR 110 in 1981.