The NEDC reference mass of vehicles H and, where applicable, of vehicles L and R shall be determined as follows:

RMn,L = (MROL – 75 + 100) [kg] RMn,H = (MROH – 75 + 100) [kg] RMn,R = (MROR – 75 + 100) [kg]

Where,

Vehicle R is the representative vehicle of the Road Load Matrix Family as defined in point 5.1 of Sub-Annex 4 to Annex XXI to Commission Regulation (EU) 2017/1151;

MRO is the mass in running order as defined in Article 2(4)(a) of Commission Regulation (EU) No 1230/2012 for vehicles H, L and R respectively.

The reference mass to be used as input for the simulations and, where applicable, for a physical vehicle test shall be the inertia value set out in Table 3 of Annex 4a to UN/ECE Regulation No 83 which is equivalent to the reference mass, RM, determined in accordance with this point and referred to as TMn,L, TMn,H and TMn,R;

According to point 6.6.3 of Appendix 3 to Annex I to Regulation (EU) 2017/1151, the lowest recommended tyre pressure for the vehicle test mass shall be used during the coast down for the road load determination, while this is not specified in the NEDC. The tyre pressure to be taken into account for the purpose of calculating the NEDC road load in accordance with point 2.3.8 shall be the average between the two axles of the average between the minimum and maximum tyre pressure permitted for the selected tyres on each axle for the NEDC reference mass of the vehicle. The calculation shall be carried out for vehicle H and, where applicable, for vehicles L and R with the following formulae:

For vehicle H: $P_{\mathrm{avg,H}}=\left(\frac{P_{\mathrm{max,H}}+P_{\mathrm{min,H}}}{2}\right)$ For vehicle L: $P_{\mathrm{avg,L}}=\left(\frac{P_{\mathrm{max,L}}+P_{\mathrm{min,L}}}{2}\right)$ For vehicle R: $P_{\mathrm{avg,R}}={\left(\frac{P_{\mathrm{max,R}}+P_{\mathrm{min,R}}}{2}\right)}^{\prime }$

Where,

Pmax, is the average of the maximum tyre pressures of the selected tyres for the two axles; Pmin, is the average of the minimum tyre pressures of the selected tyres for the two axles.

The corresponding effect in terms of resistance applied to the vehicle shall be calculated using the following formulae for vehicles H, L and R:

For vehicle H: ${\mathrm{TP}}_H={\left(\frac{P_{\mathrm{avg,H}}}{P_{\mathrm{min,H}}}\right)}^{-\mathrm{0,4}}$ For vehicle L: ${\mathrm{TP}}_L={\left(\frac{P_{\mathrm{avg,L}}}{P_{\mathrm{min,L}}}\right)}^{-\mathrm{0,4}}$ For vehicle R: ${\mathrm{TP}}_R={\left(\frac{P_{\mathrm{avg,R}}}{P_{\mathrm{min,R}}}\right)}^{-\mathrm{0,4}}$

According to point 4.2.2.2 of Sub-Annex 4 to Annex XXI to Regulation (EU) 2017/1151 the minimum tyre tread depth is 80 % for the WLTP test, while pursuant to point 4.2 of Appendix 7 to Annex 4a to UN/ECE Regulation No 83, the minimum allowed tyre tread depth for the purpose of the NEDC test is 50 % of the nominal value. That results in an average difference of 2 mm in tread depth between the two procedures. The corresponding effect in terms of the resistance applied to the vehicle shall be determined for the purpose of the NEDC road load calculation in point 2.3.8 in accordance with the following formulae for vehicles H, L and R:

For vehicle H: ${\mathrm{TTD}}_H=\left(2\times \frac{\mathrm{0,1}\times {\mathrm{RM}}_{\mathrm{n,H}}\times \mathrm{9,81}}{1000}\right)$ For vehicle L: ${\mathrm{TTD}}_L=\left(2\times \frac{\mathrm{0,1}\times {\mathrm{RM}}_{\mathrm{n,L}}\times \mathrm{9,81}}{1000}\right)$ For vehicle R: ${\mathrm{TTD}}_R=\left(2\times \frac{\mathrm{0,1}\times {\mathrm{RM}}_{\mathrm{n,R}}\times \mathrm{9,81}}{1000}\right)$

Where,

RMn,H, RMn,L, and RMn,R are the reference masses of vehicles H, L and R determined in accordance with point 2.3.1.

Determination of the road loads where, for the purpose of the WLTP test, the road loads have been determined in accordance with point 5 of Sub-Annex 4 of Annex XXI to Regulation (EU) 2017/1151.

The correlation tool shall be used to execute the simulated NEDC test of vehicle H using the relevant input data referred to in point 2.4.

The NEDC CO2 reference value for vehicle H shall be determined as follows:

CO 2, H = NEDC CO 2, C,H · Ki,H

Where,

CO 2, H is the NEDC CO2 reference value for vehicle H; NEDC CO 2, C,H is the correlation tool simulated combined NEDC CO2 result for vehicle H; Ki,H is the value determined in accordance with appendix 1 to Sub-Annex 6 to Annex XXI to Regulation (EU) 2017/1151 for vehicle H.

In addition to the NEDC CO2 reference value, the correlation tool shall also provide the phase-specific CO2 values for vehicle H.

Where applicable, the simulated NEDC test of vehicle L shall be performed using the correlation tool and the relevant input data referred to in point 2.4.

The NEDC CO2 reference value for vehicle L shall be determined as follows:

CO 2, L = NEDC CO2,C,L · Ki,L

Where,

CO 2, L is the NEDC CO2 reference value for vehicle L; NEDC CO2,C,L is the correlation tool simulated combined NEDC CO2 result for vehicle L; Ki,L is the value determined in accordance with appendix 1 to Sub-Annex 6 to Annex XXI to Regulation (EU) 2017/1151 for vehicle L.

In addition to the NEDC CO2 reference value, the correlation tool shall also provide the phase-specific CO2 values for vehicle L.

Where the randomly generated number referred to in point 3.1.1.2 is in the range of 90 to 99 the vehicle shall be selected for one physical measurement in accordance with the procedure referred to in Annex XII to Regulation (EC) No 692/2008, taking into account the precisions set out in section 2 of this Annex. The test results shall be documented in accordance with Annex VIII to Directive 2007/46/EC.

Where the NEDC CO2 value for both vehicles H and L is determined in accordance with point 3.2.1, the vehicle configuration selected for physical measurement shall be vehicle L, if the random number is in the range 90 to 94, and vehicle H, if the random number is in the range 95 to 99.

Where the NEDC CO2 value is determined in accordance with point 3.2.1 for only one of the vehicles H or L in the interpolation family, that vehicle shall be selected for one physical measurement if the random number is in the range 90 to 99.

Where the NEDC CO2 values are not determined in accordance with point 3.2.1, but both vehicle H and L are physically tested, the random number shall be disregarded.

The NEDC phase-specific values for vehicle H shall be calculated as follows:

NEDC CO 2, p,H = NEDC CO 2, p,H,c · CO 2, AF,H

Where:

p is the NEDC phase “UDC” or “EUDC”; NEDC CO2,p,H,c is the correlation tool simulated NEDC CO2 value for the phase p referred to in point 3.1.2 or, where applicable, the physical measurement result as referred to in point 3.2.2; NEDC CO2,p,H is the NEDC phase-specific value for vehicle H of the applicable phase p, gCO2/km; CO2,AF,H is the adjustment factor for vehicle H calculated by the ratio between the NEDC CO2 value determined in accordance with point 3.2 and the correlation tool simulated NEDC test result referred to in point 3.1.2 or, where applicable, the physical measurement result.

The NEDC phase-specific values for vehicle L shall be calculated as follows:

NEDC CO 2, p,L = NEDC CO 2, p,L,c · CO 2, AF,L

Where:

p is the NEDC phase “UDC” or “EUDC”; NEDC CO2,p,L,c is the correlation tool simulated NEDC CO2 value for the phase p referred to in point 3.1.2 or, where applicable, the physical measurement result as referred to in point 3.2.2; NEDC CO2,p,L is the NEDC phase-specific value for vehicle L of the applicable phase p, gCO2/km; CO2,AF,L is the adjustment factor for vehicle L calculated by the ratio between the NEDC CO2 value determined in accordance with point 3.2 and the correlation tool simulated NEDC test result referred to in point 3.1.2 or, where applicable, the physical measurement result.

Where the NEDC road load of the representative vehicle has been calculated from a WLTP representative vehicle in accordance with point 2.3.8.2.1(b), the NEDC road load of an individual vehicle shall be calculated using the following formulae: