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

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

In this Annex:
(a) Recording equipment means:
equipment intended for installation in road vehicles to show and record automatically or semi-automatically details of the movement of those vehicles and of certain working periods of their drivers;
(b) Record sheet means:
a sheet designed to accept and retain recorded data, to be placed in the recording equipment and on which the marking devices of the latter inscribe a continuous record of the information to be recorded;
(c) The constant of the recording equipment means:
the numerical characteristic giving the value of the input signal required to show and record a distance travelled of one kilometre; this constant must be expressed either in revolutions per kilometre (k = … rev/km), or in impulses per kilometre (k = … imp/km);
(d) Characteristic coefficient of the means:
the numerical characteristic giving the value of the output signal emitted by the part of the vehicle linking it with the recording equipment (gearbox output shaft or axle) while the vehicle travels a distance of one measured kilometre under normal test conditions (see Chapter VI, point 4 of this Annex). The characteristic coefficient is expressed either in revolutions per kilometre (w = … rev/km) or in impulses per kilometre (w = … imp/km);
(e) Effective circumference of wheel tyres means:
the average of the distances travelled by the several wheels moving the vehicle (driving wheels) in the course of one complete rotation. The measurement of these distances must be made under normal test conditions (see Chapter VI, point 4 of this Annex) and is expressed in the form: 1 = … mm.

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