# Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport, Division 2

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

It must be possible to adapt the constant of the recording equipment to the characteristic coefficient of the vehicle by means of a suitable device, to be known as an adaptor.
Vehicles with two or more rear axle ratios must be fitted with a switch device whereby these various ratios may be automatically brought into line with the ratio for which the equipment has been adapted to the vehicle.

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Source: https://www.legislation.gov.uk/eur/1985/3821/annex/I/division/V/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-1985-3821/annex-I/division-V/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.