(5)It is of particular importance that future measures proposed on the basis of this Regulation or procedures to be implemented in application of it comply with the principles which have been restated in the report published by the Commission in 2006 entitled ‘CARS 21: A Competitive Automotive Regulatory System for the 21st century’ (‘CARS 21’). In particular, for the purposes of better regulation and simplification and in order to avoid constant updating of existing Union legislation on issues of technical specifications, this Regulation should make reference to existing international standards and regulations which are available to the public without reproducing them in the Union legal framework.