It is necessary to complement the existing method for defining the end-points of the interpolation line used for calculating the NEDC CO₂ emission value of an individual vehicle. Those end-points, which are represented by a test vehicle with the highest CO₂ emission values, and test vehicle with the lowest values, should be defined so that the difference between the two test vehicles high and low is equal to or higher than 5 g CO₂/km.

In order to avoid that the CO₂ emission values of individual vehicles are determined on the basis of interpolation lines that do not provide the minimum difference, it is appropriate that this amendment enters into force without delay.

Where for the purpose of type approval under Regulation (EU) 2017/1151, road load matrix families are used, the calculation of the CO₂ emission value of an individual vehicle belonging to such a family should be simplified by deriving the road load coefficients to be used for the calculation of the NEDC CO₂ value from the road load coefficients of the individual vehicle as determined under Regulation (EU) 2017/1151.

In order to ensure a robust correlation output, it is appropriate to add the number of cylinders as an input to be provided for the correlation tool.

The opportunity should also be taken to correct some editorial errors in the text.

The measures provided for in this Regulation are in accordance with the opinion of the Climate Change Committee,