The Illinois Department of Transportation is warning motorists of ice- and snow-covered roads throughout the state.
Secretary Ann Schneider says people should not travel if they don't have to so crews can clear and salt icy roads and bridges that are making driving treacherous.
She says road crews are seeing many spinouts and crashes.
IDOT has more than 1,200 trucks on the roads.
She says motorists can check for the latest road conditions and closures online. Click here for links to check road conditions in Illinois, Missouri and Iowa.