In The UK
In the United Kingdom, vertical deflection in highways for the purpose of traffic calming typically takes one of the following forms:
- A road hump is the most common variety and is usually round-topped.
- A speed table is a type of hump with a central plateau which is both long and broad. It may include a pedestrian crossing. This type is preferred by some emergency services and bus operators.
- A speed cushion is a raised portion of road with a flat top only extending over part of the carriageway's width. Cushions can be used singly, in a pinch point, or in pairs or triples.
- Rumble strips are uneven road surfaces which are now only used in rural areas and retail parks because of the noise.
The Department for Transport defines the regulations for the design and use of road humps.
Read more about this topic: Speed Bump