When are bus operators required to use tachograph for regular journey?

Bus operators are required to use tachographs for regular journeys when the vehicle is used for the transport of passengers for hire or reward, and the journey exceeds 50 kilometers. Tachographs help monitor driving times, breaks, and rest periods to ensure compliance with regulations on working hours. Additionally, they are mandatory for vehicles with a maximum authorized mass over 3.5 tons or those designed to carry more than nine passengers. This ensures safety and fair working conditions for drivers.