Artikel 20

1. Every motor vehicle shall in addition to the registration number display at the back, inscribed on a plate or on the vehicle itself, the distinguishing sign of the place of registration of this vehicle. This sign shall indicate either a State or a territory which constitutes a distinct unit from the point of view of registration. In the case of a motor vehicle drawing one or more trailers this sign shall also be displayed at the back of the single trailer or of the last trailer.
2. The composition of the distinguishing sign and the manner in which it is displayed shall be as set out in Annex 4.