15. GRBP was briefed on the activities of IWG on Wet Grip Performance of Tyres in a Worn State (IWG WGWT) (GRBP-70-23) and noted that IWG WGWT planned to submit an informal document to the seventy-second session of GRBP (September 2020) and a working document for adoption at the seventy-third session (January 2021). GRBP agreed that IWG would be co-chaired by France and the European Commission. The GRBP Chair encouraged all experts to participate in IWG WGWT.

16. The expert of EC proposed enlarging the scope of IWG WGWT to C2/C3 tyres and some further modifications to its Terms of Reference (GRBP-70-03). The experts from France and Japan were of the view out that C1 tyres should remain a priority for IWG WGWT and that C2/C3 tyres should only be addressed afterwards. The experts from the Netherlands and ETRTO pointed out that the behaviour of C2/C3 tyres in a worn state is completely different from C1 tyres. GRBP decided to revert to the issue at the next session and requested IWG WGWT to consider this idea in the interim. GRBP agreed to other modifications to the Terms of Reference, as laid down in Annex IV of the session report.