Dayton's largest engineering firm has been contracted to expand the State Route 48 corridor. Woolpert Inc., a Beavercreek-based civil engineering firm, has been contracted by the Warren County Transportation Improvement District to expand a 1.5-mile stretch of the SR 48 corridor at U.S. Route 22 and Montgomery Road, according to a news release. The project will see the thoroughfare expanded from three to five lanes, with a through lane added to each direction, the release states.