Transport undertakings and drivers shall ensure the correct functioning and proper use of digital tachographs and driver cards. Transport undertakings and drivers using analogue tachographs shall ensure their correct functioning and the proper use of record sheets.

Digital tachographs shall not be set in such a way that they automatically switch to a specific category of activity when the vehicle’s engine or ignition is switched off, unless the driver remains able to choose manually the appropriate category of activity.

It shall be forbidden to falsify, conceal, suppress or destroy data recorded on the record sheet or stored in the tachograph or on the driver card, or print-outs from the tachograph. Any manipulation of the tachograph, record sheet or driver card which could result in data and/or printed information being falsified, suppressed or destroyed shall also be prohibited. No device which could be used to this effect shall be present on the vehicle.

Vehicles shall not be fitted with more than one tachograph, except for the purposes of the field tests referred to in Article 21.

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