It would be, if it did. Are you really saying that 90000 speeders will drop magically to zero? I'm guessing that the really dangerous ones won't slow down by much, but the ones a couple of MPH over will. So, the stats will look good (average speeds will drop, total number of drivers 'speeding' drops), but the road is actually no less dangerous. Actually, possibly more dangerous if the figures of extra car exhaust pollution at speed humps is to be included.