{
  "url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-5./division-5.1./division-5.1.1.1.",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-5./division-5.1./division-5.1.1.1..json",
  "legislation": "eur/2017/1151",
  "legislation_title": "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)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-1151",
  "path": "annex/Sub/4/division/division/5./division/5.1./division/5.1.1.1.",
  "kind": "division",
  "number": "5.1.1.1",
  "heading": "The road load force for an individual vehicle shall be calculated using the following equation:",
  "text": "Fc=f0+f1× v+f2× v2\nwhere:\nFcis the calculated road load force as a function of vehicle velocity, N;\nf0is the constant road load coefficient, N, defined by the equation:\nf0=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\nf0ris the constant road load coefficient of the representative vehicle of the road load matrix family, N;\nf1is the first order road load coefficient, N/(km/h), and shall be set to zero;\nf2is the second order road load coefficient, N/(km/h)2, defined by the equation:\nf2=Max0,05× f2r+ 0,95× f2r× Af∕Afr;0,2× f2r+ 0,8× f2r× Af∕Afr\nf2ris the second order road load coefficient of the representative vehicle of the road load matrix family, N/(km/h)2;\nvis the vehicle speed, km/h;\nTMis the actual test mass of the individual vehicle of the road load matrix family, kg;\nTMris the test mass of the representative vehicle of the road load matrix family, kg;\nAfis the frontal area of the individual vehicle of the road load matrix family, m2,\nAfris the frontal area of the representative vehicle of the road load matrix family, m2;\nRRis the tyre rolling resistance of the individual vehicle of the road load matrix family, kg/tonne;\nRRris the tyre rolling resistance of the representative vehicle of the road load matrix family, kg/tonne.\nFor 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.\nIf 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.\nIf 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.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) 2018/1832 of 5 November 2018 amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) 2017/1151 for the purpose of improving the emission type approval tests and procedures for light passenger and commercial vehicles, including those for in-service conformity and real-driving emissions and introducing devices for monitoring the consumption of fuel and electric energy (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/5./division/5.1./division/5.1.1.1.",
    "retrieved_at": "2026-11-01T14:44:48.753743+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}