Level II roadways, which include many of the state's busier two-lane routes, will be kept passable for drivers observing reasonable winter driving precautions. Level IIIA roads predominantly carry local traffic only. Minimum service will be provided for traffic to move safely at a restricted rate. Level IIIB roads will receive minimum service as resources become available. Level IV roads, which include several alpine highways, are closed each winter when heavy snow and weather conditions, combined with low traffic demand, render continued maintenance impractical.
Cleanup operations occur after all roads have been provided with their designated level of service.
Cleanup consists of removal of snow ridges along shoulders to provide room for future snow storage and is done during regular working hours. During extremely severe or prolonged weather, scheduling depends on available manpower and equipment.