Artikel 5

1. This Agreement shall be open until 31 December 1976 for signature by States which are either Members of the United Nations Economic Commission for Europe or have been admitted to the Commission in a consultative capacity in conformity with paragraph 8 of the terms of reference of the Commission.
2. Those States may become Parties to this Agreement by
(a) signature not subject to ratification, acceptance or approval;
(b) signature subject to ratification, acceptance or approval, followed by ratification, acceptance or approval; or
(c) accession.
3. Ratification, acceptance, approval or accession shall be effected by the deposit of an instrument in good and due form with the Secretary-General of the United Nations.