1.Without prejudice to the provisions of Articles 29 and 30, Member States shall register, and permit the sale or entry into service of, vehicles only if they are accompanied by a valid certificate of conformity issued in accordance with Article 18.
In the case of incomplete vehicles, Member States shall permit the sale of such vehicles but may refuse their permanent registration and entry into service for such time as the vehicles remain incomplete.
2.Vehicles exempted from the requirement concerning a certificate of conformity may be registered, sold or put into service only if they satisfy the relevant technical requirements of this Directive.
3.As regards small-series vehicles, the number of vehicles registered, sold or entered into service in the course of a single year shall not exceed the number of units shown in Part A of Annex XII.