An analog tachograph is a device used in vehicles to record speed and driving time. It operates using a mechanical system that includes a rotating disk, which captures data as the vehicle moves. This information helps ensure that drivers comply with regulations regarding driving hours and rest periods. The recorded data is stored on paper charts, which must be regularly replaced and analyzed. Analog tachographs are commonly used in commercial vehicles, such as trucks and buses, to promote road safety and prevent driver fatigue. They are gradually being replaced by digital tachographs, which offer more advanced features.