According to several lawyers in Louisiana & Texas, while it isn't technically illegal to drive with ice & snow on your car, YOU are responsible for any accidents caused by ice flying off your car. Keeping the vehicle exhaust is especially important in deep snow to avoid potentially hazardous build-up of carbon monoxide inside the vehicle. Remove snow from windshield wiper blades and ensure fluid nozzles are clear of snow or ice. Do not use a shovel to remove snow from the body of your vehicle. Never pour hot water over the vehicle windshield or windows.