Road Humps.

'Sleeping policeman' are a particularly stoopid idea. Joyriders go across them as if they weren't there; they cause damage to car suspensions and steering; they cause pain to invalids.
When I was released from hospital 14 days ago post op', the trip home was a painful misery because of these wretched things.
Watching people veer from side to side to lessen their effect makes me convinced that minor accidents must increase because of the things.