With certain exceptions, a bus driver must have how many off-duty hours per day?

A bus driver is required to have 10 off-duty hours per day to ensure they are well-rested and capable of operating the vehicle safely. This regulation is designed to reduce fatigue and enhance safety for both the driver and passengers. Adequate rest is crucial, as fatigue can significantly impair a driver's attention, reaction times, and decision-making abilities, which can lead to accidents.

While the other options suggest varying amounts of off-duty time, the 10-hour requirement has been established as a standard that aligns with safety regulations and industry practices. This helps to maintain safe driving conditions and ensures that bus drivers have sufficient time to recuperate between shifts.