A friend of mine was left hospitalised by a hardened piece of snow/ice off the back of a flat bed lorry. The oncoming lorry hit a bump in the road and the snow/ice went flying right through his window and into his face.
I find it incredible that some folks just don’t understand how dangerous it is to drive without properly clearing their vehicles.
Mind you, just how many people are actually taught and learn to drive in the winter. Personally I think it should be a pre-requisite before gaining your licence.