This revised proposal of UN R63 from the IMMA contains the assimilation of the original regulations and their amendments and updates to take into consideration the revision of the test methods in UN R41.

Proposed amendments to consolidate previous versions of UN Regulation No. 63 and to align the test methods with those introduced into UN Regulation No. 41.

Proposal from IMMA to update the transition provisions of UN R63 in line with new recommendations by UNECE WP29.

IMMA contribution towards the World Forum project to codify and harmonize technical terms and abbreviations used across its regulations.

This proposal would correct the reference to the latest version of ISO 10844 and introduce transitional provisions for shift of the test track from ISO 10844:1994 to ISO 10844:2011.

The purpose of this proposal is to update the reference to the latest version of the ISO 10844 and to introduce transitional provisions for the shift of the test track requirements from ISO 10844: 1994 to ISO 10844: 2014.

The purpose of this proposal is to update the reference to the latest version of the ISO 10844 and to introduce transitional provisions for the shift of the test track requirements from ISO 10844: 1994 to ISO 10844: 2014. This proposal supersedes document GRB/2015/5.

Proposal to specify that conditioning of exhaust or silencing systems is required only in cases where the fibrous materials are in contact with exhaust gases because there is no possibility for the dispersion of fibrous materials under any other condition.

UN R51 specifies that conditioning of a silencing system is necessary only in cases where exhaust gases come into contact with silencer fibrous materials. This proposal would apply the same concept in L category noise regulations.

Proposal to align the 02 series of amendments to UN Regulation No. 63 with standard 10844:2014 of the International Organization of Standardization (ISO).

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.

Proposal to allow using the state-of-the-art test track from the latest standard ISO 10844:2021.

Proposal to replace proposal for Supplement 6 of the 02 Series of amendments