28. GRSP resumed discussion on a proposal tabled by the expert from OICA (ECE/TRANS/WP.29/GRSP/2018/7) confirming that existing type approvals, granted on the basis of the preceding series of amendments, should remain accepted. GRSP adopted the proposal not amended. The secretariat was requested to submit the proposal as draft Supplement 4 to the 02 series of amendments and as draft Supplement 5 to the 01 series of amendments to UN Regulation No. 100, for consideration and vote at the November 2018 sessions of WP.29 and AC.1.