| ECE/TRANS/WP29/GRB/2009/6 - (OICA) Proposal for amendments to Regulation No. 51 - (Noise of M and N categories of vehicles) |
| ECE/TRANS/WP29/GRB/2009/5 - (Netherlands) Proposal for amendments to Regulation No. 51 - (Noise of M and N categories of vehicles) |
| ECE/TRANS/WP29/GRB/2009/4 - (Netherlands) Proposal for amendments to Regulation No. 51 - (Noise of M and N categories of vehicles) |
| ECE/TRANS/WP29/GRB/2009/3 - (Informal group on Regulation No. 41) Proposal for draft 04 series of amendments to Regulation No. 41 - (Noise of motorcycles) |
| ECE/TRANS/WP29/GRB/2008/5/Rev.2 - (CLEPA) Proposal for draft amendments to Regulation No. 59 - (Replacement silencing systems) |
