# Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport, Division 3

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

After the equipment has been checked on installation, an installation plaque shall be affixed to the vehicle beside the equipment or in the equipment itself and in such a way as to be clearly visible. After every inspection by an approved fitter or workshop requiring a change in the setting of the installation iteself, a new plaque must be affixed in place of the previous one.
The plaque must show at least the following details:
name, address or trade name of the approved fitter or workshop,
characteristic coefficient of the vehicle, in the form ‘w = … rev/km’ or ‘w = … imp/km’,
effective circumference of the wheel tyres in the form ‘1 = … mm’,
the dates on which the characteristic coefficient of the vehicle was determined and the effective measured circumference of the wheel tyres.

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Source: https://www.legislation.gov.uk/eur/1985/3821/annex/I/division/V/division/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-1985-3821/annex-I/division-V/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.