 On August 4, 1959, the commission selected the routing of I-77 to run between Interstate 85 in Charlotte and a point on the Virginia border in Elkin.That would change in late 1960, when the commission voted to route the highway just west of Mount Airy, saying the route would serve the most people.With construction beginning in the 1960s, I-77 would gain additional mileage in October 1964 when a two-mile (3 km) extension was granted by the U.S. Bureau of Public Roads.