A rare winter storm swept across most of the Deep South yesterday, turning roads into sheets of ice, dropping several inches of snow in places, snarling highways, and causing at least five deaths. Unaccustomed to the weather, drivers slid into ditches, abandoned vehicles on highways, and became trapped in miles-long traffic jams for many hours. The National Guard was out, extracting stranded motorists and transporting them to shelters - thousands remain trapped on Interstates around Atlanta today.