{
  "url": "https://openlegislation.uk/eu-regulation-2009-631/annex/part-II/chapter-IV/division-4/division-4.8",
  "json_url": "https://openlegislation.uk/eu-regulation-2009-631/annex/part-II/chapter-IV/division-4/division-4.8.json",
  "legislation": "eur/2009/631",
  "legislation_title": "Commission Regulation (EC) No 631/2009 of 22 July 2009 laying down detailed rules for the implementation of Annex I to Regulation (EC) No 78/2009 of the European Parliament and of the Council on the type-approval of motor vehicles with regard to the protection of pedestrians and other vulnerable road users, amending Directive 2007/46/EC and repealing Directives 2003/102/EC and 2005/66/EC",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2009-631",
  "path": "annex/part/II/chapter/IV/division/4/division/4.8",
  "kind": "division",
  "number": "4.8",
  "heading": null,
  "text": "The total mass of the upper legform impactor includes those propulsion and guidance components which are effectively part of the impactor during the impact, including the extra weights.\nCalculate the value of the upper legform impactor mass from:\nM = 2E / V2\nWhere:\nM Mass [kg]\nE Impact Energy [J]\nV Velocity [m/s].\nThe required velocity shall be the value derived under point 4.7 and the energy shall be derived from Figure 6 with reference to the values of bonnet leading edge height and bumper lead determined in point 4.6.3.\nThe upper legform impactor mass may be adjusted from the calculated value by up to ±10 %, provided the required impact velocity is also changed using the above formula to maintain the same impactor kinetic energy.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2009/631/annex/part/II/chapter/IV/division/4/division/4.8",
    "retrieved_at": "2026-11-01T14:51:23.654247+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."
}