"The most dangerous speed humps are those normally in older retail/business parks - the small ones made of concrete that aren't painted to show up."

One of my fondest memories is of the time where I as an electrical engineer was asked by the then Chief Engineer of the copper mine where I was working to put in a speed dip before a rail level crossing. The level crossing had had a near miss when a doctor working at the company hospital had 'beat' the barrier as a mine policeman was lowering it to let a slag train through. The train carried molten slag in tipping vessels and if the train had hit the car it would have been ghastly. In Zambia speed restriction was enforced by a speed 'dip', a depression in the surface the full width of the road. The speed rating could be designed in by setting the length, depth and slope accordingly. Provided that the driver observed the speed limit then the vehicle would go over in a smooth manner, quite unlike the humps and cushions that we have in the UK, where you get a jolt whatever speed you do.

Anyhow, the Chief Engineer was promoted to Manager and went on leave to Europe, collecting a new Mercedes saloon there. During his first week back at the mine he quite forgot having asked me to install a speed dip at the crossing and beggered up his new car. Chortle !