Division 6.2.3

Measurement with the wind tunnel method according to paragraphs 6.3. to 6.7. inclusive of this Sub-Annex shall be performed on the same three vehicles as selected in paragraph 6.2.1. of this Sub-Annex and in the same conditions, and the resulting road load coefficients, f₀, f₁ and f₂, shall be determined.

If the manufacturer chooses to use one or more of the available alternative procedures within the wind tunnel method (i.e. paragraph 6.5.2.1. on preconditioning, paragraphs 6.5.2.2. and 6.5.2.3. on the procedure, and paragraph 6.5.2.3.3. on dynamometer setting), these procedures shall also be used also for the approval of the facilities.