Division 6.7.3 Calculation of road load values

The total road load as a sum of the results of paragraphs 6.7.1 and 6.7.2. of this Sub-Annex shall be calculated using the following equation:

F_{*}^{j} = F_{Dj} + F_{Aj}

for all applicable reference speed points j, N;

For all calculated F^*_j, the coefficients f₀, f₁ and f₂ in the road load equation shall be calculated with a least squares regression analysis and shall be used as the target coefficients in paragraph 8.1.1. of this Sub-Annex.

In the case that the vehicle(s) tested according to the wind tunnel method is (are) representative of a road load matrix family vehicle, the coefficient f₁ shall be set to zero and the coefficients f₀ and f₂ shall be recalculated with a least squares regression analysis.