When must a logbook be updated?

A logbook must be updated whenever there is a change in duty status, reflecting any transition between driving, on-duty not driving, or off-duty. This requirement is crucial because it maintains an accurate record of the driver's status throughout their workday, complying with regulations that promote safety and accountability in the transportation industry.

Updating the logbook at the last change of duty status ensures that all information is recorded immediately and accurately, providing a clear and current account of the driver’s hours. Additionally, it helps prevent potential violations related to hours of service by ensuring that logs reflect the driver’s actual work time, which is essential for both regulatory compliance and the safety of all road users.

Other options suggest various timeframes for updating the logbook, but the emphasis must be on active changes that occur during the driver’s work cycle, which is why logging at each change of duty status is the correct approach.