28. [The GRPE Chair] announced that the IWG on Vehicle Propulsion System Definitions (VPSD) would submit a formal proposal for a new Mutual Resolution on Vehicle Powertrain Definitions for the June 2015 session of GRPE.

29. He introduced the informal documents, which list the acronyms and abbreviations used in UN Regulations (WP.29-165-17) and highlighted the problem of using the acronym ‘RESS’ to describe both the ‘Non-original Replacement Exhaust Silencer System’ and the ‘Non-original Replacement Exhaust System and Rechargeable Energy Storage System’ (WP.29-165-16). The World Forum endorsed the content of document WP.29-165-16 and referred the choice to its subsidiary bodies. The secretariat added that the document WP.29-165-17 would be made available on the UNECE website and it would continue to be updated on a regular basis.

23. GRB noted that WP.29, at its March 2015 session, had considered a list of acronyms and abbreviations used in Regulations (WP.29-165-17) and noted that the acronym RESS “Replacement Exhaust Silencing System” is used in Regulation No. 92. However, RESS is widely used as “Rechargeable Energy Storage System”, for example, in Regulations Nos. 10, 12, 94, 95 and 100. For this reason, WP.29 had requested GRB to introduce, in the medium term, an alternative acronym for “Replacement Exhaust Silencing System” in Regulation No. 92 (WP.29-165-16). GRB invited experts and, in particular, IMMA to study this issue and decided to revert to it at the next session.

20. GRB recalled the WP.29 request to introduce, in the medium term, an alternative acronym for “Replacement Exhaust Silencing System” (RESS) in Regulation No. 92 (WP.29-165-16). As a replacement, the experts from IMMA and OICA proposed a new term “Non-Original Replacement Exhaust Silencing System” (NORESS). GRB preliminary agreed with this proposal and noted that it was already used in the amendment proposal for Regulation No. 92 (GRB-63-09).

26. GRB recalled the WP.29 request to introduce, in the medium term, an alternative acronym for ‘Replacement Exhaust Silencing System’ (RESS) in Regulation No. 92 (WP.29-165-16). GRB noted that this issue was addressed in document ECE/TRANS/WP.29/GRB/2016/5 adopted at this session (see para. 15 above).