# 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 4.2.4: Disturbance sound and wind interference

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

Readings on the measuring instruments produced by ambient noise and wind shall be at least 10 dB(A) below the sound level to be measured. A suitable windscreen may be fitted to the microphone provided that account is taken of its effect on the sensitivity of the microphone (see point 2.1).

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Source: https://www.legislation.gov.uk/eur/2014/540/annex/II/division/4/division/4.2/division/4.2.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-540/annex-II/division-4/division-4.2/division-4.2.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.