# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 5.1.1.1: The road load force for an individual vehicle shall be calculated using the following equation:


Fc=f0+f1× v+f2× v2
where:
Fcis the calculated road load force as a function of vehicle velocity, N;
f0is the constant road load coefficient, N, defined by the equation:
f0=Max 0,05×f0r+0,95×f0r×TM∕TMr+RR−RRr1000×9,81×TM; 0,2×f0r+0,8×f0r×TM∕TMr+RR−RRr1000×9,81×TM
f0ris the constant road load coefficient of the representative vehicle of the road load matrix family, N;
f1is the first order road load coefficient, N/(km/h), and shall be set to zero;
f2is the second order road load coefficient, N/(km/h)2, defined by the equation:
f2=Max0,05× f2r+ 0,95× f2r× Af∕Afr;0,2× f2r+ 0,8× f2r× Af∕Afr
f2ris the second order road load coefficient of the representative vehicle of the road load matrix family, N/(km/h)2;
vis the vehicle speed, km/h;
TMis the actual test mass of the individual vehicle of the road load matrix family, kg;
TMris the test mass of the representative vehicle of the road load matrix family, kg;
Afis the frontal area of the individual vehicle of the road load matrix family, m2,
Afris the frontal area of the representative vehicle of the road load matrix family, m2;
RRis the tyre rolling resistance of the individual vehicle of the road load matrix family, kg/tonne;
RRris the tyre rolling resistance of the representative vehicle of the road load matrix family, kg/tonne.
For the tyres fitted to an individual vehicle, the value of the rolling resistance RR shall be set to the class value of the applicable tyre energy efficiency class in accordance with Table A4/2.
If the tyres on the front and rear axles belong to different energy efficiency classes, the weighted mean shall be used, calculated using the equation in paragraph 3.2.3.2.2.2. of Sub-Annex 7.
If the same tyres were fitted to test vehicles L and H, the value of RRind when using the interpolation method shall be set to RRH.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/5./division/5.1./division/5.1.1.1. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-5./division-5.1./division-5.1.1.1.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.