24. The Chair presented a revised list of possible issues for the future GRB activities compiled at the second informal meeting in December 2015, together with written comments by some experts (GRB-62-08-Rev.2). GRB noted that some of these issues could be addressed directly by GRB while some others might require the establishment of informal working groups (IWG). In particular, IWGs were suggested in relation to Regulations Nos. 41 and 51 for the ASEP provisions and for pass-by noise tests of vehicle in-use (during roadside checks and periodic technical inspections). The experts from France and Germany preliminarily volunteered to chair, respectively, these groups. The experts from China, Japan, Hungary, EC, IMMA and OICA expressed their support for the creation of these IWGs. GRB decided to take a decision on their establishment at its next session.

25. The expert from EC delivered a number of additional comments on GRB-62-08-Rev.2. In particular, he indicated that the ASEP provisions (in a light version) and pass-by tests were also necessary for Regulations Nos. 9 and 63, as proposed in documents GRB-63-07 and GRB-63-08. For possible new sound level limits in Regulations Nos. 9, 63, 92 and 117, as well as for re-treaded tyres, he pointed out that such limits may only be proposed after discussions with the EU member States in due time, subject to internal planning and availability of resources.

26. The expert from the Russian Federation proposed to amend the list of possible future activities, in the long term, with the following issues: infrasound and preparing a definition of quiet vehicles. The expert from ETRTO was of the view that it would be premature to address re-treaded tyres and pointed out that GRRF should also be involved in considerations of this issue.

27. GRB invited the Chair to update the list based on the comments received and decided to revert to this issue at its next session.