Many of the legislative acts adopted since 1957 have subsequently become irrelevant or obsolete due to technical or technological progress, the evolution in the policies pursued by the Union, changes in the way general Treaty rules are applied, or the development of international rules or standards.
L'initiative CARS 21 ("Competitive Automotive Regulatory System for the 21st century") consiste en un groupe de haut niveau qui analyse la législation en vigueur en vue d'améliorer le cadre réglementaire ayant une incidence sur la compétitivité de l'industrie automobile.