All southbound lanes on the Dan Ryan Expressway were closed as of midday Wednesday after a crash caused a semitruck to dump gravel and diesel fuel on the roadway.Illinois State Police were called to a two-vehicle crash about 10:45 a.m. on the Dan Ryan at 91st Street. The semi rolled over and spilled the gravel and fuel across the southbound lanes, state police said. Southbound traffic on the Dan Ryan was being diverted off at 87th Street, state police said. No injuries were reported.