Road Bump Dimensions

The only dimensions now constrained by the regulations are: maximum and minimum heights of 100mm and 25mm respectively; a minimum length of 900mm; and no vertical face to exceed 6mm in height.
It should be noted that the tolerances included in the 1990 Road Hump Regulations do not apply to the new regulations. So exceeding the 100mm height, without authorisation, would be likely to mean that Section 90E of Highways Act 1980 did not apply, with the result that the road hump could be viewed as an obstruction. (Humps constructed prior to the 1996 regulations will not be affected by this). Additionally it is not considered good practice to deliberately choose heights which are either higher or lower than those prescribed, on the grounds that the regulations would not then apply. This again would mean that Section 90E of the Highways Act would not apply with consequences for the highway authority in providing the device was not an obstruction.