This condition is not meant to describe the presence of packed snow or ice in any one area. Severe icing conditions exist when all areas are coated with ice. An example would be an extended freezing rain event that coats roads, trees, and power lines.
These events are often referred to as ice storms. When severe icing occurs response time increases due to downed power lines, fallen trees, and the need to respond to emergency situations.
During ice storms streets not normally treated are given consideration and often receive treatment. The impending weather, maintenance of priority streets, and salt supply are given consideration when assessing additional treatment needs.