Columbus school officials say bus stops and sidewalks are too hazardous in many areas. The district has cancelled classes for the third time this week. Columbus Mayor Michael Coleman ordered city plow trucks to work residential streets. Plowing and treatment in city neighborhoods will continue today. Some other school districts are operating on a two-hour delay. Columbus City Schools CLOSED Worthington City Schools 2-Hour Delay (No Morn Kindergarten) Groveport-Madison Closed Canal Winchester 2-Hour Delay