CHICAGO, IL – NOVEMBER 27: Traffic backs up on the Kennedy Expressway as commuters and holiday travelers try to get an early start on their Thanksgiving travel on November 27, 2013 in Chicago, Illinois. The Illinois Tollway expects about 10 million vehicles to travel through the states toll system from today until Monday. Chicago’s Department of Aviation said it expects another 1.9 million to travel through the city’s two airports during an eigh…