The following signs shall be exempt from regulation under this Code:
(A) Any public notice or warning required by a valid and applicable federal, state or local law, regulation or ordinance;
(B) Any sign inside a building, not attached to a window or door, that is not legible from a distance of more than three feet beyond the lot line of the zone lot or parcel on which the sign is located;
(C) Holiday lights and decorations with no commercial message; and
(D) Traffic control signs on private property, such as stop, yield and similar signs, the face of which meet Department of Transportation standards and which contain no commercial message of any sort.