Just a short note about speed humps,why were they invented?Yes indeed to slow down traffic,e.g.boy racers doing 80 mph in a housing estate.I recently damaged my jag at 10 mph.because the hump was too high.If a boy racer hit the same hump at 80mph,he would be killed,or maybe loose control and plough into a few pedersrians.Surely there should be a legal height to such humps,just high enough to slow down traffic,i.e.give you a fright,not a shock.Boy racers are not all bad,they love their cars,the same cars usually have limited ground clearance,so even a small hump will slow them down,why have 8 inch speed humps,just imagine a pensioner in a electric wheelchair doing 2 m.p.h.hitting a 8 inch hump,yes the wheelchair would turn over,I come over the speed hump next doing 10 mph and run over the pensioner,I get out of the car to help,and a boy racer hits the hump at 80 and kills us all! I rest my case