# Regulation (EU) No 540/2014 of the European Parliament and of the Council of 16 April 2014 on the sound level of motor vehicles and of replacement silencing systems, and amending Directive 2007/46/EC and repealing Directive 70/157/EEC (Text with EEA relevance), Division 5.3: Calculation of Lref

Extent: E+W+S+N.I.

Lref = Lanchor_K + SlopeK * (nref_K – nanchor_K)/1 000
Lref shall be less than or equal to 76 dB(A).
For vehicles fitted with a manual gear box having more than four forward gears and equipped with an engine developing a rated maximum net power greater than 140 kW and having a rated maximum net power/maximum-mass ratio greater than 75 kW/t, Lref shall be less than or equal to 79 dB(A).
For vehicles fitted with an automatic gear box having more than four forward gears and equipped with an engine developing a rated maximum net power greater than 140 kW and having a rated maximum net power/maximum-mass ratio greater than 75 kW/t, Lref shall be less than or equal to 78 dB(A).

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Source: https://www.legislation.gov.uk/eur/2014/540/annex/VII/division/5/division/5.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-540/annex-VII/division-5/division-5.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.