HC Deb 14 April 1981 vol 3 c292

4. A highway authority may construct road humps in a highway for which they are the highway authority if—

  1. (a) the highway is subject to a statutory speed limit for motor vehicles of 30 miles per hour or less; or
  2. (b) the road humps are especially authorised by the Secretary of State, and may remove any road humps so constructed by them.