I wrote about this back on November 14th, three days latest the time, now I write about it again.
This is from Ron Warnick's Route 66 News site.
Happy 90th Birthday to Route 66, came into being November 11, 1926. This was the day when AASHO, the American Association of State Highway Officials adopted 66 as the number for our road. It is also the birthday of all other U.S. Highways.
ROUTE 66 THROUGH THE DECADES:
1920s: The Developmental Years. Existing roads linked together, often through the center of towns. Became known as Main Street of America. The 1928 Bunion Derby brought a lot of publicity.
1930s: The Great Depression and Great Okie Migration "Grapes of Wrath" and name "The Mother Road."