Tachograph
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A tachograph combines the functions of a clock and a speedometer. Fitted to a motor vehicle, a tachograph will record not only the vehicle's speed but also the length of time that it is moving or stationary.
For reasons of public safety, many jurisdictions have limits on the working hours of drivers of certain vehicles, such as buses and trucks. A tachograph can be used to monitor this and ensure that appropriate breaks are taken.
Analogue tachographs record the driver’s periods of duty on a waxed paper disc. However, these are vulnerable to tampering, and so are being replaced by digital tachographs which record data on smart cards.
External links
Official UK site for digital tachographs (http://www.digitaltachograph.gov.uk/)