Proposal to allow use of state-of-the-art test tracks per the latest standard ISO 10844:202

Proposal to introduce measures to reduce variability in noise measurements and new test methods to measure tyre abrasion.

Proposal to allow the use of state-of-the-art test tracks per the latest standard ISO 10844:2021.

Proposal to specify the working principles of an Acoustic Vehicle Alerting System (AVAS) and to reduce measurement uncertainties during the measurement of the one third octave bands.

Proposal to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped, to make editorial improvements and updates to ISO and ASTM standards references, and to align with Supplement 2 to the 04 series of amendments, including a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2 and to remove the content of the now obsolete Annex 4 as well as all its references.

Proposal to introduce a new temperature correction formula for the rolling sound emissions of tyres of classes C1 and C2, to remove the content of the now obsolete Annex 4 as well as all its references, to update references to standards, to improve the reproducibility of the snow grip test method by replacing the current reference tyres C3 SRTTs 19.5 and 22.5 with the new reference tyres C3 SRTTs 19.5 and 22.5 siped, and to make editorial improvements for clarity and consistency across tyre regulations.

Modifications to adapt UN R138 for application to automated vehicles (based on text of the 02 series proposal to specify the working principles of an Acoustic Vehicle Alerting System (AVAS) and to reduce measurement uncertainties during the measurement of the one third octave bands).

Working draft proposal concerning wet grip performance of worn tyres.

Technical Background Information to Supplement 11 to UN R51.03