The buses had been detoured off the lakefront road due to a winter storm hitting Chicago Friday afternoon.
The buses were rerouted onto nearby surface streets. According to the CTA, "The decision was made based on weather conditions around 3 p.m. that included standing snow, blowing snow, reduced visibility and slick roadway conditions."
Hazardous conditions also led the Illinois Department of Transporation to close the ramps on Lake Shore Drive and I-55.
