Winterizing your car
A serviceable tire, left, sits beside a worn tire that is no longer road-worthy at the 86th Force Support Squadron Auto Hobby Annex on Ramstein Air Base, Germany, Sept. 14, 2017. During winter, all-season tires are only road-worthy if the tire tread is still deep enough. While German law requires a minimum of 1.6 mm. tread depth, the Allgemeiner Deutscher Automobil-Club recommends 4 mm during winter. (U.S. Air Force photo by Senior Airman Elizabeth baker)