DICKINSON — Law enforcement says an impaired driver rear-ended a Billings County school bus on Wednesday, pushing it into the path of an oncoming semi on Highway 85. According to the North Dakota Highway Patrol, the school bus was traveling north just after 3:30 p.m. and waiting to turn left onto 35th Street SW just north of Belfield, with its turn signal activated. Simultaneously, a 2011 Dodge Ram hauling a trailer was also traveling north. NDH…