YES. In America, it is illegal to drive a vehicle with inadequate visibility. If you do not do it, it can be disastrous on the road. While driving, the snow can blow off your surface & can create vision blur to the driver behind you. Also, as your vehicle heats up, it can cause the snow to melt and result in huge chunks falling off your ride, which can hurt the driver behind you. So, if you find your vehicle covered in snow, you need to brush it off before you take it to drive.