| Key points on Exterior Sound Enhancement Systems/Exterior Sound Generator requirements |
| Reference Number: R51/R138-11-01 |
| Meeting Sessions: 11th R51/R138 session (18 Jun 2025) |
| Document date: 18 Jun 25 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions and UN Regulation No. 138 | Quiet Road Transport Vehicles |
| Click here to view the full document file |
| Vehicle external sound: Questions to be discussed |
| Reference Number: R51/R138-11-02 |
| Meeting Sessions: 11th R51/R138 session (18 Jun 2025) |
| Document date: 20 Jun 25 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions and UN Regulation No. 138 | Quiet Road Transport Vehicles |
| Click here to view the full document file |
| Proposal for Exterior Sound Enhancement System (ESES) requirements |
| Reference Number: R51/R138-11-03 |
| Submitted by: OICA |
| Meeting Sessions: 11th R51/R138 session (18 Jun 2025) |
| Document date: 20 Jun 25 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions and UN Regulation No. 138 | Quiet Road Transport Vehicles |
| Click here to view the full document file |
| R51/R138 Subgroup: Minutes of the 11th (June 2025) session |
| Reference Number: R51/R138-11-04/Rev.1 |
| Meeting Sessions: 11th R51/R138 session (18 Jun 2025) |
| Document date: 15 Aug 25 |
| Relevant to: UN Regulation No. 51 | Vehicle Noise Emissions and UN Regulation No. 138 | Quiet Road Transport Vehicles |
| Click here to view the full document file |
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