Safety signs, when installed by the vehicle manufacturer, shall be permanently affixed to the vehicle and visible to the operator and occupants as designed by the vehicle manufacturer. Low Speed Vehicle Disclosure Decal. A low speed vehicle disclosure decal shall be permanently affixed to the underside of the roof of the vehicle near the windshield on the driver's side. This decal shall be approximately 3 inches high by 5 inches wide and contain the disclosure statement information noted below.