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Document Title
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UN R41 and R63: Proposal for amendments
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Reference Number
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GRBP-77-02
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Date
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Summary
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- Proposal to amend the 04 and 05 series of UN R41 and the 02 series of UN R63 to allow use of the latest state of the art ISO 10844 test track.
- ISO has updated the ISO 10844 standard to reduce track-to-track variability caused by differing interpretations and implementations of the technical requirements. The tyre/road contribution to the overall sound performance of a motorcycle is lower compared to cars.
- The improvements from the ISO 10844:2014 to the 2021 version would not result in a need for updating the surface for L-category test tracks: Updating the ISO 10844 reference would have negligible impact on the measurement procedure and measurement results.
- If however the ISO reference in the L-category noise regulations would be updated without maintaining the current ISO 10844:2014 as an option, IMMA sees a potential risk of tracks needing recertification, creating administrative burden with no practical benefit.
- If later on, the tracks would need re-surfacing anyway (e.g. due to wear), then these can be built and certified according to ISO10844:2021. Because of the above, IMMA would like to allow certification with the tracks complying to either ISO10844:2014 or ISO10844:2021.
- This proposal takes the opportunity to introduce proposals for additional corrections in R41/04 and R41/05 as specified below:
- Supplement 9 to the 04 series of amendments to UN Regulation 41 introduced a new paragraph 12.4, needing to renumber the (former) paragraphs 12.4 to 12.9 (WP.29/2021/4). Due to this renumbering, the reference to paragraph 12.7 in Annex 6 footnote a, and Annex 7 paragraph 2.6 is no longer correct and should be replaced by a reference to paragraph 12.8.
- With the introduction of the 05 series of amendments the Transitional Provisions were rewritten and footnote a of Annex 6 became obsolete.
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Source(s)
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IMMA
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Rulemaking Area(s)
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UN R41 Motorcycle Noise and UN R63 Moped Noise
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Proposal Status
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Superseded
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Meeting(s)
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Related Documents
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GRBP/2023/14
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UN R41: Proposal for Supplement 11 to the 04 series of amendments
(superseded)
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GRBP/2023/15
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UN R41: Proposal for Supplement 3 to the 05 series of amendments
(superseded)
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Downloads
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UNECE server
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.pdf format
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.docx format
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Excerpts from session reports related to this document
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GRBP | Session 77 | 7-10
Feb 2023
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4. The experts of IMMA and ISO proposed to include a reference to the latest standard ISO 10844:2021 test track in UN Regulations Nos. 41 and 63, while keeping reference to the previous version ISO 10844:2014 (GRBP-77-02). GRBP generally supported this proposal and invited IMMA and ISO to prepare an official document for consideration at the next session.
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