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This International Standard defines different multiple-vehicle combinations (vehicle combinations with more than one coupling point) and the formulae to calculate the requirement of performance for the coupling equipment used in those vehicle combinations. Vehicle categories concerned are N2, N3, O3, and O4.NOTE For these vehicle combinations, the formulae in this International Standard override the formulae in References [6], [7], [8], and [9] that apply to vehicle combinations with one coupling point only. However, the capability of the coupling equipment is still determined through tests as defined in References [6], [7], [8], and [9].