As required under Federal Motor Vehicle Safety Standards, 49 CFR §571.500 “Low Speed Vehicles”, all low speed vehicles shall be equipped with a windshield that conforms to the federal motor vehicle safety standard on glazing materials, 49 CFR §571.205. Windshields of low speed vehicles must meet the ANSI/SAE Z26.1 —1996 specifications for either AS-1 or AS-4 glazing (incorporated by reference; see 49 CFR §571.5). Safety glazing is marked with the manufacturer's trademark and the letters “AS” followed by a number from 1 through 16B. Only AS-1 or AS-4 composition may be used in the windshield. Safety glazing for 1966 and later models also has a glass manufacturer's model number or a DOT (Department of Transportation) code number. Any questions regarding glazing shall be referred to the Automotive Safety Enforcement Division of the Department of State Police. Definitions. “Cloudiness” means any degree of visible discoloration or separation, except tinting that does not affect clear vision. “Critical area” means the normal windshield wiper sweep, except the area obscured by hood, fenders, or rearview mirror. “Non-critical area” means all windshield area outside the critical area. “Normal windshield wiper sweep” means the area of windshield cleaned by the windshield wiper, excluding return position on both passenger's and driver's side. Proper Marking. Inspect glass for proper markings. Glazing Damage.