Proposal to expand the scope of the activity to include C2 and C3 tyres.

Proposal from the TPMSTI task force to revise the communication interface protocol of TPMS between towing and towed vehicles of categories N2, N3 and O3, O4, respectively (described in Annex 5 on the basis of the ISO bus requirements) in alignment with UN R13 and ISO updates. The proposal further corrects and clarifies provisions across TPMS, TPRS and CTIS.

Proposal to correct some references, which need to be updated as a consequence of document WP.29/2020/70, adopted at the June 2020 WP.29 session, notably

1. Paragraph 5.4.1 renumbered as paragraph 5.5.1.
2. Paragraphs 5.4. and 5.5. respectively renumbered as paragraphs 5.5. and 5.6.

Proposal by experts from IWG ASEP for new series of amendments.

Proposal to include requirements for wet grip of tyres of classes C2 and C3 in worn state to the scope of the working group activities.

Overview of UTAC CERAM testing designed to consider the impact of additional tightening of tyre performance limits on the balance
between legal requirements (rolling resistance, wet grip and rolling sound emission) and other performance aspects not subject to legal requirements.

Measurement Uncertainties informal group proposal to clarify the text and to amend:

1. Annex 3, Paragraph 1.4. to delete determination of the vehicle speed by independent speed measuring devices
2. Annex 3, Paragraph 1.5. to clarify that no determination of the wind speed is needed for indoor testing
3. Annex 3, Paragraph 2.1.3. to clarify and differentiate between indoor and outdoor testing
4. Annex 3, Paragraph 2.1.3.1.2. to clarify the temperature range for indoor facilities.
5. Annex 3, Paragraph 2.1.3.2.2. to clarify the temperature range for outdoor facilities.

Proposal to clarify:

1. Signature of the 3PMSF test reports
2. Mould cure retreaded tyre (not UN R117 pattern).