Here in the UK, on public roads, they are legally required to sign post that ANPR[1] is in use in that area, and the cameras have to be easily seen, AND a brigh

Here in the UK, on public roads, they are legally required to sign post that ANPR[1] is in use in that area, and the cameras have to be easily seen, AND a bright yellow colour. The shady side of it, is on private property, like car parks, where those rules don't apply. --- [1] Automatic NUMBER plate recognition.