During the 169th session of WP.29 (para. 39 of the session report), the World Forum was informed that, following the entry into force of the new European legislation on provisions on real driving emissions and Worldwide Harmonized Light Vehicle Test Procedure (WLTP) as of September 2017, no new vehicles will be allowed to enter into the European market without fulfilling these new provisions.

WP.29 agreed to introduce transitional provisions in UN Regulations Nos. 83 and 101 to specify that Contracting Parties applying UN Regulations Nos. 83 and 101 which would also apply WLTP as defined in UN GTR No. 15 (such as the EU) would have no obligation to accept type-approvals granted on the basis of test cycles other than WLTP as of September 2017 (para. 41 of the 169th session report). WP.29 requested the secretariat to prepare an official document for the WP.29 March 2017 session, subject to the endorsement of GRPE at its January 2017 session, on supplements to UN Regulations Nos. 83 and 101 introducing such transitional provisions.

Thus, the secretariat has prepared this text to allow for such a derogation from mutual recognition requirements under UN R83 and R101 until such time as GTR 15 has been transposed into UN Regulations under the 1958 Agreement.