At left, firemen rest after fighting fires that resulted from a multi-vehicle accident that killed at least nine people, on Interstate 75 near Gainesville, Fla., Sunday, Jan. 29, 2012. Authorities were still trying to determine what caused the pileup on the highway, which had been closed for a time because of the mixture of fog and heavy smoke from a brush fire. At least five cars and six tractor-trailers were involved, and some burst into flame. (AP Photo/Phil Sandlin)