This is a tricky problem, but I don't think limiting the numbers to public cameras would work. I'm not sure any numerical approach would. In Atlanta, for insta

This is a tricky problem, but I don't think limiting the numbers to public cameras would work. I'm not sure any numerical approach would. In Atlanta, for instance, the cameras surveilled by the police are 90% privately owned. And this isn't just "with a warrant" or "when a shopkeeper reports a crime and provides tapes", but nonstop, integrated access to their feeds. Conversely, a lot of the cameras in London may be private, unconnected, and indoors, which I agree is much less worrying. But the Ring of Steel does far more surveillance per-camera-per-capita than any shop camera, since it has unified design meant to maximize how many people are identifiably captured on camera.