4. The expert from the Informal Working Group on Measurement Uncertainties (IWG MU) reported on their activities (GRBP-78-09).

5. The experts of IWG MU introduced a new draft document for reference on measurement uncertainties which addressed UN Regulations Nos. 51 and 117 as a first step (GRBP-78-07). The experts from France and the United Kingdom posed questions, while the experts from Germany and the Netherlands pointed out a large test track uncertainty. The Chair invited IWG MU to liaise with the above experts with the aim to prepare a revised document for the next session.

6. The experts of IWG MU presented a proposal for amendments to the Consolidated Resolution on the Construction of Vehicles (R.E.3) (GRBP-78-08). The experts from France, Germany, Netherlands, Switzerland and the United Kingdom commented on the proposal. In view of these comments and of the need to consult with the Working Party on General Safety Provisions (GRSG), GRBP agreed to revert to GRBP-78-08 at its next session.

7. The expert of the Informal Working Group on Additional Sound Emission Provisions (IWG RD-ASEP) presented their status report (GRBP-78-14) and the updated Terms of Reference (GRBP-78-13). GRBP agreed to rename IWG to the Informal Working Group on Real Driving – Additional Sound Emission Provisions (IWG RD – ASEP) and adopted its Terms of Reference, as contained in annex II to the session report.

8. GRBP took note of an interim report on the ongoing ASEP/ RD-ASEP study presented by OICA (GRBP-78-34).

9. GRBP was informed that the Task Force on Quiet Road Transport Vehicles (TF QRTV) had identified the need that UN Regulation No. 51 regulate noise emissions of Battery Electric Vehicles (BEVs) with sound enhancement systems other than the Acoustic Vehicle Alerting System (AVAS) of UN Regulation No. 138. The expert from OICA presented a first draft of amendments to UN Regulation No. 51 to address this issue (GRBP-78-10).

10. GRBP expressed concerns about aftermarket products that create artificial noise of BEVs other than for safety purposes, and generally supported the idea to eliminate a “grey area” between UN Regulations Nos. 51 and 138. GRBP noted that OICA would prepare a revised document for BEVs with AVAS.