When should a commercial driver log their hours of service?

A commercial driver must log their hours of service at the end of each day and whenever their duty status changes. This requirement is essential to ensure compliance with regulations governing the maximum driving hours and mandatory rest periods, designed to promote safety on the roads. By logging hours at the end of each driving day, the driver provides an accurate record of their work hours, which helps to prevent fatigue by adhering to limits on driving time.

Additionally, documenting duty status changes—such as when moving from driving to on-duty not driving, or from on-duty to off-duty—is crucial for maintaining a complete and accurate log. This not only protects the driver and others on the road but also aids in regulatory compliance and enforcement.

The other options do not encompass the full requirements necessary for proper logging of hours of service, which is why they are insufficient for commercial drivers.