23. The expert from USA, referring to ECE/TRANS/WP.29/2013/63, reported on the progress made on unresolved issues before its potential adoption. GRRF noted that testing results on the wet traction test procedure from the USA would need to be evaluated before a recommendation could be made to refer the GTR for adoption by WP.29/AC.3. The Chair of GRRF indicated that he would provide a status update to WP.29 at the upcoming March session and ask for additional time to consider the USA research results. A second issue concerning the bead unseat test for which the expert from China had planned to offer a proposal was resolved when it was announced that China would accept the existing procedure in the GTR.

Note by the secretariat: WP.29 agreed (in March 2014) to hold an extraordinary GRRF session during the Thursday afternoon session of WP.29 on 26 June 2014 dedicated to this agenda item.