From the Illinois State Police District 10:
Due to the snowfall in all District 10 counties: Champaign, Coles, Douglas, Macon, and Vermilion, roadways and interstates are experiencing icing. It’s especially evident on bridge decks. Please use caution when traveling in these counties and along Interstates 57, 72, and 74. There have already been several crashes which are causing significant backups on I-57 at Milepost 250 and complete lane closure on I-74 East at Milepost 216.