{
  "url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-5./division-5.1./division-5.1.2.1.",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-5./division-5.1./division-5.1.2.1..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/5.1.2.1.",
  "kind": "division",
  "number": "5.1.2.1",
  "heading": "The running resistance for an individual vehicle shall be calculated using the following equation:",
  "text": "Cc=c0+ c1× v+ c2× v2\nwhere:\nCcis the calculated running resistance as a function of vehicle velocity, Nm;\nc0is the constant running resistance coefficient, Nm, defined by the equation:\nc0=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\nc0ris the constant running resistance coefficient of the representative vehicle of the road load matrix family, Nm;\nc1is the first order road load coefficient, Nm/(km/h), and shall be set to zero;\nc2is the second order running resistance coefficient, Nm/(km/h)2, defined by the equation:\nc2 = 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))\nc2ris the second order running resistance 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;\nr′is the dynamic radius of the tyre on the chassis dynamometer obtained at 80 km/h, m;\n1,02is an approximate coefficient compensating for drivetrain losses.",
  "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/5.1.2.1.",
    "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."
}