Picture shows a Fed Ex truck that tried to go up S. Dearborn Street and pass a minivan going down. The minivan slid down and hit the side of the Fed Ex truck that turned 180 degrees half way up Dearborn. After taking out two large trees the mass of steel, plastic and rubber hulks came to rest on a parked minivan part way down the hill. While the drivers were standing outside the jumble of wrecks a Jeep decided to turn down Dearborn and slid into the jumble of vehicles adding to the confusion and mess. See the attached photo. I guess they did not see the snow closure signs posted at were each end.