# 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 2.4: Instrumentation for speed measurements

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

The engine speed shall be measured with instrumentation having an accuracy of ± 2 % or better at the engine speeds required for the measurements being performed.
The road speed of the vehicle shall be measured with instrumentation having an accuracy of at least ± 0,5 km/h, when using continuous measurement devices.
If testing uses independent measurements of speed, this instrumentation shall meet specification limits of at least ± 0,2 km/h.

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Source: https://www.legislation.gov.uk/eur/2014/540/annex/II/division/2/division/2.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-540/annex-II/division-2/division-2.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.