I was overtaken by a BMW the other while slowing down from a 60 limit to a 40 where I know there is often a speed camera ( road goes past a school and at certain times it becomes a 20 limit). The Beemer hardly reduced speed and shot away, and guess what no speed van in sight, some people break the limits all the time and rarely get caught, other more careful drivers seem to drift over the limit and get a ticket - no justice is there really...