5. GRBP was briefed on the activities IWG RD – ASEP (GRBP-80-04).

6. The expert from OICA reported on the ongoing ASEP/ RD-ASEP study (GRBP-80-31) which included two parts:

1. their own tests of eight vehicles (four pairs of old and successor models) according to the 02 and 03 series of amendments to UN Regulation No. 51, ASEP and partly RD-ASEP, and
2. an analysis of data on RD-ASEP collected from the type approval authorities and technical services under the monitoring phase according to the 03 series of amendments to UN Regulation No. 51.

7. Regarding (ii), the expert of OICA explained that the collected data might not be representative enough, due to the low number of datasets the majority of which had been received from two type approval authorities. Thus, he wondered whether the current mandatory RD-ASEP testing period could be extended with the aim to cover more vehicles and powertrain technologies.

8. GRBP noted that the legally established monitoring period had ended in June 2024 and that further data should be collected until the end of December 2024 only on a voluntary basis. GRBP also agreed that OICA should contact the type approval authorities to find out the number of vehicle manufacturers whose test data had been submitted anonymously.

9. The expert from the Informal Working Group on Measurement Uncertainties (IWG MU) presented a revised document for reference (GRBP-80-07-Rev.1) replacing ECE/TRANS/WP.29/GRBP/2024/8 considered at the previous session. The experts from the Netherlands, Switzerland, United Kingdom and EC expressed concerns over possible misinterpretation of the purpose and content of the document, in particular the suggested 3.5 dB(A) margin and the last sentence in paragraph 1.1.1. In the absence of a consensus, the Chair proposed to keep the document on the agenda of the next session as a working document.

10. The expert of OICA proposed a regulatory package for the sound emission limits of electric vehicles (EVs) equipped with Exterior Sound Enhancement Systems (ESES) (ECE/TRANS/WP.29/GRBP/2024/22, GRBP-80-20-Rev.1 and GRBP-80-21-Rev.1). The expert of EC introduced a counter proposal (GRBP-80-12 and GRBP-80-23), including an alternative definition of Exterior Sound Producing and Amplifying System (ESPAS) in lieu of ESES. According to her, for EVs the emission of additional exterior sound is only acceptable as long as it addresses safety concerns and should be strictly prohibited whenever safety is not at stake, as in the case of ESPAS or ESES. In addition, she proposed to include EVs in the scope of ASEP, in order to reap the full benefits of switching to EVs in terms of noise emission. In reply, the expert from OICA pointed out that in many situations AVAS was not sufficient for road safety (for example, in the vicinity of schools) and that ESES could play a role in those situations. He also mentioned that there seemed to be a market demand for ESES from some drivers who otherwise would not buy EVs.

11. The expert from Switzerland pointed out that there was no easy way to determine a worst-case situation with regard to ESES. For this reason, he supported the EC proposal rather than the OICA one, but acknowledged the fact that all parties in GRBP share the objective of addressing this issue.

12. The expert from the Netherlands expected a positive effect of the increasing number of EVs on noise reduction, particularly in cities at urban speeds, being the key consideration for the Netherlands. According to him, prohibiting ESES, as suggested by EC, seemed to be the most certain solution to secure the EV noise reduction benefits at this moment. He was also mindful of other influencing factors.

13. The expert from France stated that, to combat noise pollution for the well-being of the society, it would be impossible for the Government to justify adding unnecessary noise to EVs. The expert from the United Kingdom stated that he would need more time to study the proposals in combination with draft amendments to UN Regulation No. 138 (see paras. 18-21 below). The experts from Germany and Japan pointed out that any prohibition of ESPAS (ESES) should be done with caution and suggested that this topic be discussed further in a new subgroup (group of interest) and then by IWG RD-ASEP.

14. The expert from OICA volunteered to act as Secretary, should a new subgroup be established. The experts from Switzerland and EC indicated their interest in co-chairing the new subgroup, subject to approval of their management. GRBP welcomed these statements and noted that the new subgroup could kick off in conjunction with the meetings of IWG RD-ASEP and GRBP Task Forces (TF) in October 2024 (see para. 45 below). In the interim, GRBP invited all experts to send their comments to the experts from EC and OICA without delay, with a view to preparing a working document for the next session.