Motorists will have to be cautious as they head home this evening.
Public works crews around the county said the sub-zero temperatures and wind chills made salting roads ineffective.
Mark DeVries, the maintenance superintendent for McHenry County Division of Transportation, added that the winds from the west are leading to drifting snow on north and south roads.
At some spots, snow is drifting past the white lines on the roads, DeVries said. Traffic lanes should have wheel tracks for vehicles to follow, but there could be some icy spots, he added.
"All roads are passable ... we have the trucks out continuing to go up and down [the roads], but we need the wind to quit," DeVries said.
"Crews will stay on this throughout the night to keep things as safe as we can," DeVries added.
Victor Ramirez, director of public works for Crystal Lake, said crews surrendered salting roads as it was ineffective and tried to attack the problem with aggressive deicing chemicals that still had a hard time cracking through the ice.
Vince Olsen, internal services superintendent for Algonquin, has run into the same problem.
"The salt is just not working right now so we're blading ice off where we can and only putting down salt in some areas," he said.
The McHenry County Sheriff's Office reported there have been 170 motorist assists county-wide the last two days for drivers who went off the road, stalled and even ran out of gas.