On the motorway there is nothing more effective at traffic control than a police car cruising along quite happily in the slow lane!! There was one on the M4 this morning and I just have to admit that I do find it quite amusing to see the moment when a whole bunch of drivers have just spotted this police car - all the brake lights come on!!
Then everyone sits there doing the speed limit that they should be doing, but as soon as the police car starts flashing blue lights and speeds off to wherever it needs to go, everyone pretty quickly starts to speed up again!!
It just goes to show that if people think that they can get away with something then they will certainly try, but as soon as they think that they might get caught then they pretend that they are as good as gold and would never even dream of going faster than they should! ;-)
If you've never seen that police car = brake lights phenomenon then it is worth looking out for - it makes me smile every time!