Begin US Route 99
This sign marks the beginning of US Route 99. This is at the southern end of the highway, in Calexico, California, across the U.S./Mexico border from Mexicali, Baja California.
Update: This image was used in an article by Brian Herzog on the Swiss Army Librarian website: 2009 Begins with 99 Things, January 1, 2009.
Corner of East First Street and Heffernan Avenue, Calexico, California.