Certainly most of these signs on which the driver is shown the speed. I think the original sense should be to point out to the road users that they may be driving too fast. Freely, if we had flashed them now, it would have become possibly expensive. So far I also felt these signs quite helpful, I had the situation myself to pass such a measurement and at the same time terrified to find that I But now my opinion has changed. For 3 days I have been standing in the street about 20m away from my house such a measuring board. I can no longer sleep quietly. In the afternoon it is still going, since it is generally louder and manache drivers speed up intentionally when they see the sign. At night in the time of 1:00 – 05:00 clock several hourly some drivers race through our road and that with speeds of up to 170km/h (our road is a zone of 30) as I could already read it on the sign. Here’s a video of a youtuber so you know what I mean: http://www.youtube.com/watch?v=uvAY6_e8D6c Part of it is still being hailed and screamed. So I wonder now if you should not ban these ads, obviously these ads do not serve traffic safety, but do exactly the opposite.