Sorry but it’s a black and white thing in this case, r either you’re under the speed limit and not breaking the law or you’re over the speed limit and breaking the law.
This isn’t actually true. It’s entirely possible to be breaking the law while driving under the speed limit: “driving too fast for conditions” is very much a thing.
But that’s beside my point, which really was just that changing the design of the street to make people not want to speed in the first place is way more effective (and frankly, way less totalitarian) than punishing them after-the-fact for doing so.