3. GRB resumed discussion on ECE/TRANS/WP.29/GRB/2012/5, tabled by the expert from the Russian Federation, providing harmonizing definitions on vehicle type concerning noise, the terms noise and sound. The expert from the Russian Federation introduced comments (GRB-57-21) to the concerns raised by the expert from IMMA to his proposal during the September 2012 session of GRB. The expert from IMMA recalled his reservation (GRB-56-08) to ECE/TRANS/WP.29/GRB/2012/5 and announced the provisions of further information for the September 2013 session of GRB. Accordingly, GRB agreed to resume discussion on this proposal at its next session on the basis of detailed information provided by the experts concerned.

4. GRB also resumed discussion on GRB-56-04, tabled by the expert from ISO, updating the text of the UN Regulation concerning the test site with the latest amendment of ISO Standard 5130:2012. The expert from ISO announced that the objectivity of the criteria in verifying the level of porosity of the test site had been clarified with expert from Germany and that a revised proposal was not needed. GRB agreed to resume consideration on this subject at its next session and requested the secretariat to distribute GRB-56-04 with an official symbol.