{
  "url": "https://openlegislation.uk/eu-regulation-2009-1222/annex-V/division-4/division-4.2/division-4.2.8/division-4.2.8.3",
  "json_url": "https://openlegislation.uk/eu-regulation-2009-1222/annex-V/division-4/division-4.2/division-4.2.8/division-4.2.8.3.json",
  "legislation": "eur/2009/1222",
  "legislation_title": "Regulation (EC) No 1222/2009 of the European Parliament and of the Council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2009-1222",
  "path": "annex/V/division/4/division/4.2/division/4.2.8/division/4.2.8.3",
  "kind": "division",
  "number": "4.2.8.3",
  "heading": "Calculation of the adjusted average peak braking force coefficient",
  "text": "The average peak braking force coefficient of the reference tyre used for the calculation of its braking force coefficient is adjusted according to the positioning of each candidate tyre in a given test cycle.\nThis adjusted average peak braking force coefficient of the reference tyre ( Ra ) is calculated in accordance with table 3 where R 1 is the average peak tyre braking coefficient in the first test of the reference tyre (R) and R 2 is the average peak tyre braking coefficient in the second test of the same reference tyre (R).\nTable 3\nNumber of candidate tyre(s) within one test cycle\nCandidate tyre\nRa\n1\n( R 1 -T1- R 2 )\nT1\nRa = 1/2 ( R 1 + R 2 )\n2\n( R 1 -T1-T2- R 2 )\nT1\nRa = 2/3 R 1 + 1/3 R 2\nT2\nRa = 1/3 R 1 + 2/3 R 2\n3\n( R 1 -T1-T2-T3- R 2 )\nT1\nRa = 3/4 R 1 + 1/4 R 2\nT2\nRa = 1/2 ( R 1 + R 2 )\nT3\nRa = 1/4 R 1 + 3/4 R 2",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Inserted by Commission Regulation (EU) No 228/2011 of 7 March 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip testing method for C1 tyres (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2009/1222/annex/V/division/4/division/4.2/division/4.2.8/division/4.2.8.3",
    "retrieved_at": "2026-11-01T14:51:03.606681+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."
}