No, i am currently learning driving and that would confuse me so much
For clarity, the idea is that the sign would not turn on unless you were speeding. So there should be no confusion, and it would be no different from the current "YOUR SPEED IS" signs (except, that those are always on and tend to strobe when people go over the limit).
My thought is that someone might not be bothered by being told what speed they are going. After all, they SHOULD ALREADY KNOW! But if they are told what the consequences are for speeding in real time, perhaps it might deter some drivers or bring attention to those who are unaware?*
*Some are just assholes who will speed no matter what. And then run from the police when they are spotted. You can't really deter those drivers with a sign, or laws...
I absolutely know what should be done, but it's extremely difficult to convince planners and decision makers to do it.
Hell, I was told by a city planner that the only way they could put painted lines on some bike routes was if they kept on-street parking (NIMBYs did not want safe roads).
So, now have bike routes with painted "bike lanes", but people just use it as a parking lane, making it more dangerous for cyclists... maddening, and unnecessarily frustrating.
And in other areas, we have bollards to slow down traffic, but guess what? Assholes park in a way that makes it dangerous for cyclists!
Like this guy:
Or this guy: