# Commission Implementing Regulation (EU) 2016/799 of 18 March 2016 implementing Regulation (EU) No 165/2014 of the European Parliament and of the Council laying down the requirements for the construction, testing, installation, operation and repair of tachographs and their components (Text with EEA relevance), Division (224): If the recording equipment displays the vehicle odometer value and speed, the following details shall appear on its display:

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

near the figure indicating the distance, the unit of measurement of distance, indicated by the abbreviation ‘km’,
near the figure showing the speed, the entry ‘km/h’.
The recording equipment may also be switched to display the speed in miles per hour, in which case the unit of measurement of speed shall be shown by the abbreviation ‘mph’. The recording equipment may also be switched to display the distance in miles, in which case the unit of measurement of distance shall be shown by the abbreviation ‘mi’.

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Source: https://www.legislation.gov.uk/eur/2016/799/annex/1/division/3/division/3.26/division/224 (the official version)
Page: https://openlegislation.uk/eu-regulation-2016-799/annex-1/division-3/division-3.26/division-224
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.