related to the public action.
public area: means that its open for general public, no exceptions made. like most bigger city's nowadays, the city-centre, is being stuffed with surveillance camera's. since the city centre is called "public area", you can question if it's really that open, because you're constantly being watched.
ofcourse, the reasons are for the safety of the general public.

but why are people feeling unsafe? it's not that the public area is the most crime-related-area of the city. au contraire!
if compared with other regions in the suburbs, the city centre is pretty darn safe! when entering the public area, you are notified of the hidden surveillance camera;s, by numerous warning signs.

With semiotics in mind, these signs, instead of reassuring the general public, create some form of angst. The subconscious will relate these signs, with possible crime.
"there is camera-surveillance in this area. Camera-surveillance makes it easier to prosecute crime, hence, in this area is crime, because else there would be no need for camera surveillance."
A misplaced feeling of fear, which keeps the general public on a leash.

but who's watching?
maybe this is the beginning of george orwell's 1984? maybe big brother is secretly gathering information on all of us, researching our life-pattern, or habits, or culture, and sells that information to grand-kapital megalomanic multi-galactical bussiness-centre;s? maybe there's some secret voyeuristic underground commune with big bucks to spend, who gets turned on by it, which result in strange orgies including elephants?

on an overnight during some normal week, a group of 3 people, packed with heavy-duty-glue, industry-double-sided-sticky-tape, and cut-to-size warning signs went out to the "public area", and followed their predetermined route d'altèratiôn, changing all the "camera-surveillance" warning signs in the area with their own-made. after that night, instead of the city of breda, the klitink cultus was watching over you.

You feel much safer now, don't you?