30. The Chair of GRRF recalled the establishment of GTR No. 16 (Tyres) in the Global Registry, the authorization to develop an amendment to GTR No. 16 (see ECE/TRANS/WP29/AC.3/42) and the sponsorship of the Russian Federation for this activity. The expert from ETRTO reported (GRRF-80-04, GRRF-80-05) and presented the status of the work done by the group of interested experts dealing with this amendment (GRRF-80-20, GRRF-80-21 and GRRF-80-22). GRRF explored the possible wording to be used to allow Contracting Parties to transpose at their wish some of the optional tests in the GTRs and therefore reviewed the precedent case of GTR No. 7. GRRF experts agreed to send written comments to the group of interested experts and to have a webex meeting in October, so that a formal proposal can be submitted for consideration at the February 2016 session of GRRF.