[1] Until a uniform test procedure is established for the determination of the adhesion curve for vehicles with a maximum mass exceeding 3.5 tonnes, the curve established for passenger cars may be used. In this case, for such vehicles, the ratio kpeak to klock shall be established using a value of kpeak as defined in Appendix 2 to this annex. With the consent of the Technical Service, the coefficient of adhesion described in this paragraph may be determined by another method provided that the equivalence of the values of kpeak and klock are demonstrated. a0c0