What is the function of a tachograph in commercial vehicles?

Answer: B — To record vehicle speed and driving time

The function of a tachograph in commercial vehicles is to record vehicle speed and driving time. This device is essential for ensuring compliance with regulations regarding driver working hours and road safety. It accurately logs how long a driver has been on the road and at what speeds they have been traveling, which helps monitor adherence to legal limits on driving time and rest periods. By recording these parameters, the tachograph plays a crucial role in preventing driver fatigue, which is a significant factor in traffic accidents. Additionally, the data collected can be used by employers to enforce safe driving practices and maintain operational efficiency.