Preliminary tests using the draft GTR procedures on tires in the US market have raised concerns that a wet traction index value requirement for “all-season tires” (as used in the US) will be needed since these tires fall outside the tire types addressed by the GTR. The US proposes language to address this situation.

Changes agreed upon during the speciall GRRF session to finalize the draft global technical regulation on tires, especially in response to the amendments proposed by the United States (document GRRF-77-01).