31. The expert from the United Kingdom, Co-Chair of the Task Force on Tyre Abrasion (TF TA), reported on their progress (GRBP-80-22). He explained that TF TA was conducting market assessment for developing future limits for tyre abrasion based on the two adopted test methods, namely the outdoor road circuit method and the indoor drum method. To ensure proper multi-circuit and multi-drum correlation, GRBP encouraged additional test centres to join the assessment campaign.