What is the primary purpose of keeping a logbook for commercial driving?

The primary purpose of keeping a logbook for commercial driving is to track driving hours. This is crucial for ensuring that drivers adhere to federal regulations concerning hours of service, which are designed to prevent fatigue among drivers and enhance overall road safety. By recording the number of hours driven, rest periods taken, and other relevant activity, drivers can demonstrate compliance with these regulations, manage their time effectively, and ensure they are not driving beyond legally permissible limits. This practice not only protects the driver but also contributes to the safety of all road users.

The other options relate to important aspects of commercial vehicle operation but do not specifically encompass the primary function of a logbook. Monitoring vehicle maintenance schedules focuses on the mechanical upkeep of the vehicle, while documenting passenger information is relevant for operations involving passengers, and maintaining fuel receipts pertains to expense tracking. While these are significant, they do not serve the main intent of logbooks in the context of driving hours.