The following signs are exempt from provisions of this section:
(a) Governmental signs, notices posted by governmental authority or as required by law, and religious insignia.
(b) Historical or commemorative signs issued by a recognized historical agency.
(c) Residential security signs limited to a maximum one square foot of face area and two such signs per lot.
(d) Traffic and directional signs indicating points of entry or exit for a facility or off-street parking area, provided such signs are limited to a maximum two square feet in face area and three feet in height, do not interfere with safe traffic circulation and do not interfere with or obstruct the view of drivers exiting onto streets or highways and do not contain information other than the words "in", "enter", "entrance", "out" or "exit" and/or arrows indicating desired traffic movement.