On 18 June 2021, the Secretary-General of the United Nations, acting in his capacity as depositary, communicated the following:

Within the period of six months from the date of the depositary notification by which the Secretary-General transmitted to the Governments of the Contracting Parties the text of UN R158, none of the Contracting Parties to the 1958 Agreement notified the Secretary-General of their intention not to apply UN R158 on the date of its entry into force.

Therefore, UN R158 is adopted with the date of entry into force for all Contracting Parties on 10 June 2021.