Drivers and pedestrians throughout the viewing area were greeted with slick and slippery conditions Monday night, and those conditions were expected to continue into the Tuesday morning commute.
Fender benders were reported all over the city, such as a pair of Austin, Texas tourists who got hit behind at Fulton and Damen.
"He was probably going too fast, but you could see ice with the headlights," Darryl Freeman said.
Chicago had 75 salt trucks out, but even walking on the sidewalks posed hazards.
"When it's white you expect it, but frozen stuff, that's really scary, that's when you have to watch it," Chris Dingman said.
Several accidents were reported during rush hour, particularly in the western and northwestern suburbs.
A pickup truck slid off the road into a retention pond on Roosevelt Road in front of Elmhurst Memorial Health. All of the passengers were able to get out of the vehicle before suffering any injuries.
According to the DuPage County communications page, at least a dozen accidents were reported in the area since shortly after 4 p.m.
Northwest Indiana drivers were also dealing with slick roads, with accidents slowing traffic to a crawl on Interstate 94 just south of the Gary Airport and the Toll Road.
Drivers were urged to use caution on Tuesday morning, especially on untreated roads.