http://www.legislation.gov.uk/eur/2018/985/article/4Commission Delegated Regulation (EU) 2018/985 of 12 February 2018 supplementing Regulation (EU) No 167/2013 of the European Parliament and of the Council as regards environmental and propulsion unit performance requirements for agricultural and forestry vehicles and their engines and repealing Commission Delegated Regulation (EU) 2015/96 (Text with EEA relevance)Commission Delegated Regulation (EU) 2018/985Commission Delegated Regulation (EU) 2018/985 of 12 February 2018 supplementing Regulation (EU) No 167/2013 of the European Parliament and of the Council as regards environmental and propulsion unit performance requirements for agricultural and forestry vehicles and their engines and repealing Commission Delegated Regulation (EU) 2015/96 (Text with EEA relevance)2020-12-12King's Printer of Acts of Parliamenthttps://webarchive.nationalarchives.gov.uk/eu-exit/https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02018R0985-20200701texttext/xmlen2020-07-01CHAPTER IISUBSTANTIVE REQUIREMENTS
Article 4External sound levels

In order to meet the requirements of Article 19(4) of Regulation (EU) No 167/2013, the manufacturer shall ensure that agricultural and forestry vehicles and their systems, components and separate technical units that may affect the vehicle's external sound levels are designed, constructed and assembled, and that their external sound levels are measured so as to comply with the requirements laid down in Annex II.