Artikel 31

1. Any amendment to this Convention may be proposed by any Contracting State. The text of such proposed amendment shall be communicated to the Secretary-General of the United Nations who shall transmit it to each Contracting State with a request that such State reply within four months stating whether it,
(a) desires that a Conference be convened to consider the proposed amendment, or
(b) favours the acceptance of the proposed amendment without a Conference, or
(c) favours the rejection of the proposed amendment without a Conference.
The proposed amendment shall also be transmitted by the Secretary-General to all States, other than Contracting States, invited to attend the United Nations Conference on Road and Motor Transport.
2. The Secretary-General shall convene a Conference of the Contracting States to consider the proposed amendment, if the convening of a Conference is requested
(a) by at least one quarter of the Contracting States in the case of a proposed amendment to any part of the Convention other than the Annexes,
(b) by at least one third of the Contracting States in the case of a proposed amendment to an Annex other than Annexes 1 and 2,
(c) in the case of Annexes 1 and 2 by at least one third of the States bound by the Annex to which an amendment has been proposed.
The Secretary-General shall invite to the Conference such States, other than Contracting States, invited to attend the United Nations Conference on Road and Motor Transport or whose participation would, in the opinion of the Economic and Social Council, be desirable.
The provisions of this paragraph shall not apply in cases where an amendment to the Convention has been adopted in accordance with paragraph 5 of this article.
3. Any amendment to this Convention which shall be adopted by a two thirds majority vote of a Conference shall be communicated to all Contracting States for acceptance. Ninety days after its acceptance by two thirds of the Contracting States each amendment to the Convention, except for those to Annexes 1 and 2, shall enter into force for all the Contracting States except those which, before it enters into force, make a declaration that they do not adopt the amendment.
For the entry into force of any amendment to Annexes 1 and 2 the majority shall be two thirds of the States bound by the amended Annex.
4. The Conference may by a two thirds majority vote determine at the time of the adoption of an amendment to this Convention, except for those to Annexes 1 and 2, that the amendment is of such a nature that any Contracting State which has made a declaration that it does not accept the amendment and which then does not accept the amendment within a period of twelve months after the amendment enters into force shall, upon the expiration of this period, cease to be a party to the Convention.
5. In the event of a two thirds majority of the Contracting States informing the Secretary-General pursuant to paragraph 1 (b) of this article that they favour the acceptance of the amendment without a Conference, notification of their decision shall be communicated by the Secretary-General to all the Contracting States. The amendment shall upon the expiration of ninety days from the date of such notification become effective as regards all the Contracting States except those States which notify the Secretary-General that they object to such an amendment within that period.
6. As regards amendments to Annexes 1 and 2, and any amendment not within the scope of paragraph 4 of this article, the existing provisions shall remain in force in respect of any Contracting State which has made a declaration or lodged an objection with respect to such an amendment.
7. A Contracting State which has made a declaration in accordance with the provisions of paragraph 3 of this article, or has lodged an objection in accordance with the provisions of paragraph 5 of this article to an amendment, may withdraw such declaration or objection at any time by notification addressed to the Secretary-General. The amendment shall be effective as regards that State upon receipt of such notification by the Secretary-Generaal.