I-85 in Georgia and required a two-lane detour on US 27 and US 29 between those cities. The northern section between Newnan and Grantville was completed first, then the stretch further south to LaGrange was completed in 1977. The portion of the highway from the Buford Highway Connector to SR 400 was constructed during the early 1980s and was designed as a replacement for the original four-lane routing of I-85 (now SR 13). In addition, the new viaduct was designed to accommodate connections to the SR 400 tollway (then in planning), HOV lanes, and a bridge carrying the North Line (then under construction, now the Red Line). Until 2000, the state of Georgia used the sequential exit numbering system on all of its Interstate Highways. The first exit on each highway would begin with the number 1 and increase numerically with each exit. In 2000, GDOT switched to a mileage-based exit system, in which the exit number corresponded to the nearest milepost. On October 1, 2011, GDOT converted the HOV lanes in northern Atlanta into express/HOT lanes. From Atlanta, I-85 north was originally slated to be built through the city of Athens to provide an easy link between the capital city and the University of Georgia. However, then-Governor Ernest Vandiver worked to make sure the highway traversed his home county of Franklin, a stretch that now bears his name. At the time, he promised equivalent access for Athens and Gainesville. It was not until the completion of SR 316 in the 1990s that there was finally a relatively quick, multilane expressway connecting Athens and Atlanta, (US 78 is also multilane between Athens and Atlanta but it is not expressway-grade) although SR 316 still is largely at-grade. On March 30, 2017, a fire started at approximately 6:15 pm in a storage area under the highway along Piedmont Road in the Piedmont Heights area of Midtown Atlanta. This caused the collapse of a section of I-85 northbound. The highway in both directions needed to be demolished and replaced. According to GDOT, the work was completed ahead of schedule. Both the north and south bound portions of the Interstate were open by May 15, 2017, a month ahead of expectations. Future In May 2017, the Gwinnett County Board of Commissioners voted to accept about $6 million (equivalent to $ in ) in federal funds, to be used to acquire land to build a