http://www.legislation.gov.uk/eudr/1991/422Commission Directive 91/422/EEC of 15 July 1991 adapting to technical progress Council Directive 71/320/EEC on the approximation of the laws of the Member States relating to the braking devices of certain categories of motor vehicles and their trailersCommission Directive 91/422/EECenQueen's Printer of Acts of Parliament2019-09-07