[Russ]

Any changes to a road by a council need to be set within strict health and safety guidelines, this includes maintanence. This explains why roadwork take such a long time to complete: they need to be sure the roads are safe.

Speed bumps also need to be kept within certain guidelines. As long as they are, say 8 inches (I'm not sure of the exact figure) high then driving over them at a safe speed should not cause any injury or damage. This is taken in to account by the insurance companies if you then chose to make such a claim.