9. GRB recalled the amendment proposals to Regulation No. 51 adopted at the previous session (ECE/TRANS/WP.29/2018/7) and addressed the pending issue on whether or not the adopted proposals would require a new series of amendments and/or transitional provisions. The experts from the Informal Working Group on Additional Sound Emission Provisions (IWG ASEP) and from OICA presented their views (GRB-67-14 and GRB-67-06). GRB agreed that the adopted proposals should become a new Supplement 3 to the 03 series of amendments to Regulation No. 51 and be accompanied with the following transitional provision (a new paragraph 11.9.):

“11.9.

Until 18 months after the date of entry into force of the Supplement 3, it shall not apply to extensions of existing approvals, originally granted prior to the date of entry into force of Supplement 3.”

10. GRB requested the secretariat to issue, as soon as possible, an addendum to ECE/TRANS/WP.29/2018/7 with the above text, thus allowing Contracting Parties to prepare for its consideration at the forthcoming session of WP.29 in March 2018.

53. In particular, the GRB chair mentioned that GRB had adopted amendment proposals to Regulation No. 51 which would introduce an option of indoor testing, according to standard ISO 362-3, upon understanding that the Type Approval Authority could always mandate an outdoor test for verification. He further pointed out that GRB had addressed the pending issue of transitional provisions for the earlier amendment proposals to Regulation No. 51 which had been submitted to the March 2018 session of WP.29 as ECE/TRANS/WP.29/2018/7. GRB had agreed that these proposals should be introduced as a Supplement with an 18-month transitional period and requested the secretariat to issue an addendum to ECE/TRANS/WP.29/2018/7.