Shortly before 11 p.m. Friday, snow command notified 174 trucks to report to their routes on Chicago's main streets and Lake Shore Drive.
The trucks patrolled and treated pavement as necessary.
Falling snow is expected to continue during the day Saturday, when some accumulation is possible, according to ABC7 meteorologist Mark Bishop.
Bishop also reported that the early-morning snow broke a record, making this February the snowiest in Chicago history with 28.6 inches. The previous record was set in 1896.
The snow is expected to come to an end Saturday night.