These are speed-bumps near my mother's house in Wales: https://goo.gl/maps/hdThhzduxpp https://goo.gl/maps/hdThhzduxpp – they're sort of trapezoid, they work to

These are speed-bumps near my mother's house in Wales: https://goo.gl/maps/hdThhzduxpp https://goo.gl/maps/hdThhzduxpp – they're sort of trapezoid, they work to slow traffic, but above a certain speed you definitely feel less of a bump too.