- Get a grip. To have adequate snow traction, a tire requires at least 6/32-inch deep tread, according to The Tire Rack. (New passenger-car tires usually have 10/32-inch of tread.) Ultrahigh-performance "summer" tires have little or no grip in snow. Even "all-season" tires don't necessarily have great snow traction: Some do, some don't. If you live where the roads are regularly covered with snow, use snow tires (sometimes called "winter tires" by tiremakers). They have a "snowflake on the mountain" symbol on the sidewall, meaning they meet a tire-industry standard for snow traction.
- Make sure you can see. Replace windshield wiper blades. Clean the inside of your windows thoroughly. Apply a water-shedding material (such as Rain-X) to the outside of all windows, including the mirrors. Make sure your windshield washer system works and is full of an anti-icing fluid. Drain older fluid by running the washers until new fluid appears: Switching fluid colors makes this easy.
- Run the air-conditioner. In order to remove condensation and frost from the interior of windows, engage your air-conditioner and select the fresh air option: It's fine to set the temperature on "hot." Many cars automatically do this when you choose the defrost setting.
Courtesy of: Edmunds