6. On behalf of IWG ASEP, the expert from Germany reported on their activities (GRBP-72-16) and proposed modifications to the Terms of Reference (ToR) (ECE/TRANS/WP.29/GRBP/2020/10 and GRBP-72-17). GRBP adopted the revised ToR as laid down in Annex III of the session report.

7. The expert from Norway, in his capacity as Chair, Informal Working Group on Measurement Uncertainties (IWG MU), reported on the progress of IWG MU (GRBP-72-11) and proposed revised ToR (GRBP-72-10). GRBP adopted the revised ToR of IWG MU as laid down in Annex IV of the session report.

8. The expert of EC informed GRBP about progress of the study on the sound level limits of M- and N-category vehicles (GRBP-72-25). The expert from Japan thanked EC for sharing this information and pointed out that his country was also conducting a similar study.