There were dozens of crashes throughout southern Wisconsin as rain turned to ice when it hit roads.
In Milwaukee County, the sheriff's department reported 18 crashes and 23 disabled vehicles Friday evening.
In Dane County, Monona police were responding only to crashes involving injuries and road blockages Friday night because there weren't enough officers to investigate the many non-injury crashes.
Lt. Frank Fenton says Monona officers had trouble walking to crash scenes because of the ice.
Brian Hahn, service hydrologist with the National Weather Service, says the air temperature was a little above freezing and the ground was cold as rain fell, which caused the hazardous conditions.
The weather caused at least two dozen high school hockey, basketball and wrestling events to be called off Friday night.