Yesterday I followed a DOT truck with a snow plow blade under the chassis.  This blade constantly shed sparks as the track made the five mile track. At the end of the short stretch of road the truck stopped. I knew the driver so I stopped to chat. .  He was in the process of having to move the blade as the past few day of plowing had worn of most of the blade in contact with the pavement.  Now tell me studded tires on my car did as much to the surface over that five miles as the surgical scraping of the ice of the surface.