We have few like this in Cheam village, It even makes the Range rovers slow down at first although they soon learn they can glide over fairly easily.
My area has so many speed humps its unreal, TFL put them as well as the local council and make a pigs ear of it every time.
These ones have a point as they cut off some bad rat runs, but the rat runs are there due to bad traffic management further up the road.
Consequently we have a lot of 4x4's being used as run arounds in sutton.....