Study evaluating the validity of the current recommendation in Annex 3 Appendix 5 for sandpaper surface replacement interval based on running distance by examining test results exceeding 20,000 km. Testing nine consecutive runs on #80 grit sandpaper without replacement over 45,000 km total distance using new tyres for each run. Surface roughness measured by MPD and micro roughness showed no significant change and satisfied requirements in Paragraph 2.4.2.3. SRTT17S abrasion level remained above specification limits. Reproducibility of Abrasion Index was maintained when compared with Market Assessment results. Proposes extending replacement interval from 20,000 km to 30,000 km for 2-position drums and from 40,000 km to 60,000 km for 1-position drums.

Document confirms night-time requirements for C2P scenario testing in UN R152, specifying that tests shall apply to M₁ and N₁ vehicles, cover crossing collision only at 5 km/h pedestrian walking speed, include both with lights and without lights conditions, test only 50% collision point using adult dummies, operate at 20–60 km/h activation speed with no obstruction, and align speed reduction calculation with UN R152. Discusses daytime requirements for C2C and C2P scenarios, noting Japan’s position that the IWG should establish priorities among proposed new requirements.

Case studies analysing real-world UK collisions where Advanced Emergency Braking Systems (AEBS) were fitted using GB STATS19 police and RAIDS national research databases. A total of 287 cases were characterised against UN Regulation No. 152 scenario requirements: car-to-car (141 cases), car-to-pedestrian (81 cases), and car-to-bicycle (28 cases). Cases were scored according to alignment with regulatory test scenarios across nine characteristics: subject vehicle speed, target speed, relative speed, ambient light, lateral overlap, trailer coupled, road layout, road surface condition, and weather conditions. Lateral overlap was the most frequently misaligned characteristic across pedestrian and cyclist scenarios. Road geometry was the most frequent misalignment in car-to-car scenarios. Speed requirements and ambient light conditions warrant consideration for regulatory review.

Minutes of the 50th session of TFTA held on 6 July 2026. TFTA approved previous meeting minutes and agenda. The SWG Secretary updated on workplan 2026 organizational matters. ETRTO reported two best practice sessions on open road convoy method on 26 June and 3 July, with JATMA organizing a drum method session on 7 July. JASIC provided comments on the UTAC timeline Gantt; TFTA agreed to simplify subject lines 13-15, keep the February 2027 timeline with a review note after summer 2026, and retain line 24 with an indicative note. Action items assigned include preparing a revised Gantt and contacting test facilities on tread depth measurements. Discussion covered C1 mileage potential metric development, C2 test method status and equivalence framework for C2 tyres, and C3 test method development with a brainstorming workshop planned for 8-9 October in hybrid format. TFTA agreed to prepare Supplement 1 to UN Regulation No. 186 with submission deadline week of 9 November 2026.

Draft minutes of the 51st session of the Task Force on Tyre Abrasion held 25 August 2026. The session covered status of the 2026 workplan organizational matters, including TAPP participation, equivalence evaluation of test facilities, and best practice meetings. The TFTA agreed to a consolidated Gantt chart with versioning and regular review. A hybrid brainstorming workshop on the C3 test method is scheduled for 8-9 October 2026 in Brussels and remotely. The Co-chairs will prepare a revised TFTA status report for GRBP’s 84th session.