# Council Regulation (EEC) No 3821/85 of 20 December 1985 on recording equipment in road transport, Division 4: Measurement of errors

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

The measurement of errors on installation and during use shall be carried out under the following conditions, which are to be regarded as constituting standard test conditions:
vehicle unladen, in normal running, order
tyre pressures in accordance with the manufacturer's instructions,
tyre wear within the limits allowed by law,
movement of the vehicle: the vehicle must proceed, driven by its own engine, in a straight line and on a level surface, at a speed of 50 ± 5 km/h; provided that it is of comparable accuracy, the test may also be carried out on an appropriate test bench.

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Source: https://www.legislation.gov.uk/eur/1985/3821/annex/I/division/VI/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-1985-3821/annex-I/division-VI/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.