johno1234:
They can do on the right kind of street. There others where it just seems to encourage people to slam on their brakes and then gun their engine until the next brake slam. At least the modern long flat speed bumps are pleasant enough to drive over at the intended speed. The old fashioned little sharp ones break your suspension and put you into the head lining at anything over about 5kph.
Where by "old fashioned" you mean the ones that my local council started installing all over the place a couple of years ago...
