All pre-treating the roads does is make them very slick and ruin the underside of your car. They've been doing this in Maine for 10 yrs and people hate it. If it is cold and it snows, you are much better off with no treatments on the road. Anyone can drive in cold snow if you know what you're doing. But now they pre-treat the roads before every storm and it makes for a greasy, slippery mess - like a spring snowstorm. Much more slippery than if they had just left it alone. And the pretreating truly rots cars right to death. If people don't have their cars undercoated, they can discover their frame is totally rusted before the rest of the car is showing any serious signs of wear.