| GRB/52 | Report of the GRB on its 54th session | |
| GRB-54-03 | German Position on new limit values for 03 series of amendments to R51 | |
| GRB-54-05 | Proposal for draft amendments to titles of UN Regulations related to vehicle and tyre noise emissions | |
| GRB-54-06 | Discussion on draft amendments to Regulation Nos. 51, 59, and 117 | |
| GRB-55-01 | Japanese Position on new limit values for 03 series of amendments to Regulation No. 51 | |
| GRB-55-04 | Proposal for draft amendments to Regulation No. 51 - 03 series | |
| GRB-55-05 | Discussion for limit values of ECE R51 – 03 series | |
| GRB-55-05 | Discussion for limit values of ECE R51 – 03 series | |
| GRB-55-05/Rev.1 | Discussion for limit values of ECE R51 – 03 series (Revised) | |
| GRB-55-07 | CEDR Project Group Noise: Value for Money in Noise Abatement | |
| GRB-55-09 | Proposal for draft 03 series of amendments to Regulation No. 51 | |
| GRB-55-09 | Proposal for draft 03 series of amendments to Regulation No. 51 | |
| GRB-55-10 | Japanese proposal on R51 limit values | |
| GRB-55-10/Rev.1 | Japanese proposal on R51 limit values (Revised) | |
| GRB-55-10/Rev.1 | Japanese proposal on R51 limit values (Revised) | |
| GRB-55-13 | Current Status of Noise Regulation Review in Japan | |
| GRB-55-16 | Reducing Noise Emissions from Motor Vehicles: New EU Legislative proposal | |
| GRB-55-18 | Proposal of transitional provisions | |
| GRB/2005/2/Rev.2 | Revised proposal for draft amendments to Regulation No. 51 | |
| GRB/2005/5 | Proposal for draft amendments to Regulation No. 51 | |
| GRB/2012/2 | Proposal for the 03 series of amendments to Regulation No. 51 | |
| GRB/2012/3 | Proposal for the 03 series of amendments to Regulation No. 51 | |
| WP.29/2011/152 | Proposal for guidelines on the scope, administrative provisions and alternative requirements in Regulations annexed to the 1958 Agreement |