{
  "url": "https://openlegislation.uk/eu-directive-2015-996/annex/division-ASSESSMENT/division-2/division-2.2/division-2.2.1/division-3/division-3",
  "json_url": "https://openlegislation.uk/eu-directive-2015-996/annex/division-ASSESSMENT/division-2/division-2.2/division-2.2.1/division-3/division-3.json",
  "legislation": "eudr/2015/996",
  "legislation_title": "Commission Directive (EU) 2015/996 of 19 May 2015 establishing common noise assessment methods according to Directive 2002/49/EC of the European Parliament and of the Council (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-directive-2015-996",
  "path": "annex/division/ASSESSMENT/division/2/division/2.2/division/2.2.1/division/3/division/3",
  "kind": "division",
  "number": null,
  "heading": "Individual vehicle",
  "text": "In the traffic flow, all vehicles of category m are assumed to drive at the same speed, i.e. vm , the average speed of the flow of vehicles of the category.\nA road vehicle is modelled by a set of mathematical equations representing the two main noise sources:\n1.. Rolling noise due to the tyre/road interaction;\n2.. Propulsion noise produced by the driveline (engine, exhaust, etc.) of the vehicle.\nAerodynamic noise is incorporated in the rolling noise source.\nFor light, medium and heavy motor vehicles (categories 1, 2 and 3), the total sound power corresponds to the energetic sum of the rolling and the propulsion noise. Thus, the total sound power level of the source lines m = 1, 2 or 3 is defined by:\nL W,i,m v m = 10 × lg 10 L WR,i,m v m ∕ 10 + 10 L WP,i,m v m ∕ 10\n(2.2.2)\nwhere LWR,i,m is the sound power level for rolling noise and LWP,i,m is the sound power level for propulsion noise. This is valid on all speed ranges. For speeds less than 20 km/h it shall have the same sound power level as defined by the formula for vm = 20 km/h.\nFor two-wheelers (category 4), only propulsion noise is considered for the source:\nLW,i,m = 4 (vm = 4 ) = LWP,i,m = 4 (vm = 4 )\n(2.2.3)\nThis is valid on all speed ranges. For speeds less than 20 km/h it shall have the same sound power level as defined by the formula for vm = 20 km/h.",
  "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/eudr/2015/996/annex/division/ASSESSMENT/division/2/division/2.2/division/2.2.1/division/3/division/3",
    "retrieved_at": "2026-11-01T15:21:38.862218+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."
}