21. The expert from Finland reported on the progress of the Task Force on Studded Tyres (TF ST) (GRBP-73-07) and introduced a proposal for a new UN Regulation which had been prepared by TF ST (ECE/TRANS/WP.29/GRBP/2021/5). GRBP agreed to revert to the document at the next session, thus giving GRBP experts an opportunity to further study the document and to provide comments.