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Image:Tachoscheibe.jpg|thumb|250px|The Tachograph Chart]]
A '''tachograph''' is a device that combines the functions of a clock and a speedometer. Fitted to a motor vehicle, a tachograph records the vehicle's speed and the length of time that it is moving or stationary. The mechanical tachograph writes on a round piece of paper which constantly turns throughout the work day. The marker moves nearer to or further from the center according to the driving speed. An entire rotation encompasses 24 hours.