CHAPTER V CUSTOMS UNION AND LIBERALISATION OF TRADE Article 29 Customs Union Member States of each regional economic community agree to progressively establish among them during a transitional period specified in Article 6 of this Treaty, a Customs Union involving: (a) The elimination, among Members States of each regional economic community, of customs duties, quota restrictions, other restrictions or prohibitions and administrative trade barriers, as well as all other non-tariff barriers; and (b) The adoption by Member States of a common external customs tariff. Article 30 Elimination of Customs Duties Among Member States of Regional Economic Communities 1. During the second stage, Member States of each regional economic community shall refrain from establishing among themselves any new customs duties and from increasing those that apply in their mutual trade relations. 2. During the third stage, Member States shall progressively reduce and eliminate finally among themselves, at the level of each regional economic community, customs duties in accordance with such programme and modalities as shall be determined by each regional economic community. 3. During each stage, the Assembly, on the recommendation of the Council, shall take the necessary measures with a view to co-ordinating and harmonising the activities of the regional economic communities relating to the elimination of customs duties among Member States. Article 31 24