How often must a CDL driver keep a logbook?

Answer: B — Every day of driving

A CDL driver is required to maintain a logbook every day of driving to accurately record their hours of service. This is essential for monitoring compliance with federal regulations, which dictate the maximum hours a driver can operate a commercial vehicle without rest. The logbook serves as a record of the driver's activities, including driving time, off-duty time, and rest periods, ensuring that they adhere to safety regulations and prevent driver fatigue. Keeping a daily log helps to facilitate enforcement of these regulations by providing a clear account of how many hours a driver has worked and rested. This is particularly crucial for maintaining safety on the roads, as it helps to reduce the risk of accidents caused by fatigued drivers. Therefore, the requirement to log every day of driving is a critical aspect of responsible and legal commercial driving practices.