Interstate 640 (abbreviated I-640)'s a bypass of Interstate 40 running north of Knoxville, Tennessee. For many years only about a two-mile (3 km) segment of it between State Route 33 (Broadway/Old Broadway exit) and U.S. Highway 25 (Clinton Pike exit) was open. Finally, the road was completed in anticipation of the traffic which was to be generated by the 1982 World's Fair. Today it's especially important for traffic going east on Interstate 40 which intends to turn northward on Interstate 75;… (More on I-640)