4. The expert from IMMA proposed amendments with the aim to minimize proliferation of approval numbers from models with differences in vehicle exhaust and silencing systems (ECE/TRANS/WP.29/GRBP/2019/25). The experts from Germany, Japan, Russian Federation and Spain commented on the proposal. The Chair invited IMMA to prepare a revised document for the next session.

3. The expert from IMMA presented a revised proposal which aims to minimize a proliferation of approval numbers (ECE/TRANS/WP.29/GRBP/2019/25/Rev.1 and GRBP-71-18-Rev.2). Following an in-depth discussion, GRBP adopted the proposal, as laid down in Annex II. GRBP requested the secretariat to submit it to WP.29 and the Administrative Committee (AC.1) for consideration and vote at their June 2020 sessions as a draft Supplement 8 to the 04 series of amendments to UN Regulation No. 41, together with ECE/TRANS/WP.29/GRBP/2019/24 adopted at the previous session.