Area commuters can learn more about state plans to extend high occupancy toll lanes, or HOT lanes, to Hamilton Mill Road in Gwinnett County at public meetings over the next couple of weeks. The 10-mile project, running along Interstate 85 and beginning at Old Peachtree Road, also involves construction of a bridge at Interstate 985, which cuts through North Gwinnett, then Hall County en route to Gainesville. Teri Pope, district spokeswoman for the Georgia Department of Transportation, has said that bridges on Express Lanes — as they are formally called — are just structures “with a specified use.”