# 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 5.1.2.1: The running resistance for an individual vehicle shall be calculated using the following equation:


Cc=c0+ c1× v+ c2× v2
where:
Ccis the calculated running resistance as a function of vehicle velocity, Nm;
c0is the constant running resistance coefficient, Nm, defined by the equation:
c0=r′∕1,02×Max 0,05×1,02×c0r∕r′+0,95×1,02×c0r∕r′×TM∕TMr+RR−RRr1000×9,81×TM; 0,2×1,02×c0r∕r′+0,8×1,02×c0r∕r′×TM∕TMr+RR−RRr1000×9,81×TM
c0ris the constant running resistance coefficient of the representative vehicle of the road load matrix family, Nm;
c1is the first order road load coefficient, Nm/(km/h), and shall be set to zero;
c2is the second order running resistance coefficient, Nm/(km/h)2, defined by the equation:
c2 = r′/1,02 × Max((0,05 × 1,02 × c2r/r′ + 0,95 × 1,02 × c2r/r′ × Af/Afr); (0,2 × 1,02 × c2r/r′ + 0,8 × 1,02 × c2r/r′ × Af/Afr))
c2ris the second order running resistance 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;
r′is the dynamic radius of the tyre on the chassis dynamometer obtained at 80 km/h, m;
1,02is an approximate coefficient compensating for drivetrain losses.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/5./division/5.1./division/5.1.2.1. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-5./division-5.1./division-5.1.2.1.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.