This morning's snowfall caused numerous slide-offs and crashes. As of 7:55 a.m., Kankakee County Sheriff's Department reported it had worked 21 accidents, Chief Deputy Ken McCabe said. He said he saw three vehicles on their roofs on Interstate 57 between the Bourbonnais Parkway exit and Exit 308 on the southside of Kankakee as he drove into work. "It's winter, folks. It's Illinois. It's snow and you need to slow down," McCabe said. "It must have been icy earlier this morning. This is not a big snow event." Even if roadways are clear, there is the chance for patches of black ice, McCabe said.