A traffic alert for Roswell drivers. the city says portions of roads on the west and southwest side of the Roswell Air Center will close starting Wednesday and much of Thursday, as the National Champsionship Air Races conducts its first course test flights. This means that on Wednesday starting at 12: 30 p.m., traffic on West Hobson Road will be closed west of Sunset Road. Traffic on Old YO Crossing Road will not be allowed north of Pierre Road. Traffic on YO Road will not be allowed west of Nashville Road. The National Championship Air Races are scheduled to be held in Roswell in September. The course test flights are not open to the public.