With effect from 1 July 2016, national authorities shall, on grounds relating to indirect vision, consider the certificates of conformity of new vehicles of categories N₂ and N₃ approved to Directive 2003/97/EC of the European Parliament and of the Council4 to be no longer valid for the purposes of Article 26 of Directive 2007/46/EC, and shall prohibit the registration, sale and entry into service of such vehicles.