The paper initially sets the scene by giving a resume of the history of vehicle regulations in Europe. It goes on to explain the differences between the United Nations (U.N.) and Common Market (C.M.) organisations, together with their separate approaches towards the harmonisation of Vehicle Construction Regulations in Europe.The inter-relationship of the national legislation of the individual countries to the regulations of the Common Market and United Nations organisations is explained. The procedures and processes for establishing compliance with the national regulations of the countries of Europe and with the harmonised regulations for vehicles and vehicle systems is contrasted with the American/Canadian self-certification systems. The techniques by which the authorities in Europe also satisfy themselves that conformity is maintained in production are set out.The rule making process for new regulations within the Common Market and United Nations organisations is explained, together with the process by which vehicle manufacturers are permitted, indeed, are required to comment on and contribute to the formulation in Europe.Reasons for the lack of harmonisation of regulations between the North Americans and Europe are suggested. Whilst the emphasis in Europe on greater control of the environmental type of regulation, is shown to be understandable under the different living conditions in most European countries compared with those in North America, a means by which greater unanimity could be achieved is suggested.