You can also tell when the police are about with Speed traps, just watch the HGV drivers giving thumbs down Lillyemon, or if you see a HGV on an A or B road Flashing & you might think, what the hell is that crank flashing for, there is something he / she has passed & could cause an accident Eg, sheep, tree branch in the road, Ice, flood, If I thought that there was something that could endanger someones safety, That's what I used to do. This time of the year with snow Ice coming be aware of the signs given out by some HGV drivers. ( But not all)