{
  "url": "https://openlegislation.uk/eu-regulation-2009-1222/annex-IVa/division-6",
  "json_url": "https://openlegislation.uk/eu-regulation-2009-1222/annex-IVa/division-6.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/IVa/division/6",
  "kind": "division",
  "number": "6",
  "heading": "PROCEDURE FOR THE ALIGNMENT OF A CANDIDATE LABORATORY",
  "text": "One reference laboratory ( l ) of the network shall calculate the linear regression function of the candidate laboratory ( c ), A2 c and B2 c , as follows:\nRRC m,l = A2 c × RRC m,c + B2 c\nwhere:\nRRC m,l is the measured value of the rolling resistance coefficient by the reference laboratory ( l ) (including temperature and drum diameter corrections)\nRRC m,c is the measured value of the rolling resistance coefficient by the candidate laboratory ( c ) (including temperature and drum diameter corrections)\nThe aligned RRC of tyres tested by the candidate laboratory is calculated as follows:\nRRC = (A1 l × A2 c ) × RRC m,c + (A1 l × B2 c + B1 l )",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Inserted by Commission Regulation (EU) No 1235/2011 of 29 November 2011 amending Regulation (EC) No 1222/2009 of the European Parliament and of the Council with regard to the wet grip grading of tyres, the measurement of rolling resistance and the verification procedure (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2009/1222/annex/IVa/division/6",
    "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."
}