The Road Traffic Acts 1960 and 1972, and Road Traffic Regulation Act 1967 (Metrication) (No.2) Regulations 1981
In order to fulfil obligations arising from Council Directive 80/181/EEC of 20th December 1979 on the approximation of laws of the Member States relating to units of measurement, these Regulations, which are made under section 2(2) of the European Communities Act 1972, metricate the units of measurement in the sections of the Road Traffic Acts 1960 and 1972, and the Road Traffic Regulation Act 1967 which are specified in the Schedule to these Regulations as indicated in that Schedule.