Oakwood has adopted a policy to limit how long city vehicles sit with their engines idling, hoping it will reduce pollution and save fuel, City Manager Stan Brown said. Brown is an enthusiastic representative of Oakwood in Hall County’s Environmental Management System, which was established in 2010. The countywide system and its program, EnviroShare, is a voluntary network of local governments, school systems, residents, businesses and nonprofit organizations who work together toward common environmental goals.