3M AUTHORIZED. Official 3M reflective films and inks on durable, rustproof aluminum ensures that our signs meet all DOT requirements for outdoor parking and traffic signs. Hi Intensity Reflective Aluminum is 3x more reflective than Engineer Grade. OFFICIAL SIGNS. Buy the same signs sold to our governmental customers. Over 1,000 municipalities buy their signs from us. LAMINATED. To achieve maximum durability, sign graphic are protected with a 3M traffic sign laminate. This provides enhanced weather and graffiti resistance. ROUNDED CORNERS. Signs have rounded corners and burr-free corners for safe handling, longer life and a professional appearance. INSTALLATION. All signs come with pre-punched and pre-cleared mounting holes for easy installation. Signs mount to U-channel posts, square or round galvanized posts, wooden posts and chain link fences.