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1. Any Contracting State may propose one or more amendments to this Protocol. The text of such proposed amendment shall be communicated to the Secretary-General who shall transmit it to each other Contracting Party bound by this Protocol with a request that such Contracting Party 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 Parties, invited to attend the United Nations Conference on Road and Motor Transport.
2. The Secretary-General shall convene a Conference of the Contracting Parties to consider the proposed amendment, if the convening of a Conference is requested by at least one third of the Contracting Parties.
The Secretary-General shall invite to the Conference such States, other than the Contracting Parties, who were 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 this Protocol has been adopted in accordance with paragraph 5 of this article.
3. Any amendment to this Protocol which shall be adopted by a two thirds majority vote of a Conference, shall be communicated to all Contracting Parties for acceptance. Ninety days after its acceptance by two thirds of the Contracting Parties each amendment shall enter into force for all Contracting Parties except those which, before it enters into force, make a declaration that they do not adopt the amendment.
4. The Conference may by a two thirds majority vote determine at the time of the adoption of an amendment to this Protocol that it is of such a nature that any Contracting Party 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 this Protocol.
5. In the event of a two thirds majority of the Contracting Parties 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 this decision shall be communicated by the Secretary-General to all the Contracting Parties. The amendment shall on the expiration of ninety days from the date of such notification become effective as regards all Contracting Parties except those which notify the Secretary-General that they object to such an amendment within that period.
6. As regards amendments not within the scope of paragraph 4 of this article, the existing provisions shall remain in force in respect of any Contracting Party which has made a declaration or lodged an objection with respect to such an amendment.
7. A Contracting Party which has made a declaration in accordance with the provisions of paragraph 3 of this article or has lodged an objection in accordance with 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 Contracting Party upon receipt of such notification by the Secretary-General.