A driver must not drive after accumulating how many hours of 'elapsed time'?

The correct answer is that a driver must not drive after accumulating 16 hours of 'elapsed time.' The National Safety Code regulations delineate a specific limit on driving hours to ensure safety on the road. After 16 hours of driving or being on duty, a driver is at increased risk of fatigue, which can significantly impair their ability to operate a vehicle safely.

This regulation is implemented to protect not only the driver but also other road users, as fatigue can lead to slower reaction times, decreased awareness, and poor judgment. By adhering to the 16-hour limit, drivers can better maintain their alertness and operational capability.

While other options present longer times, they exceed the established safety guidelines meant to mitigate risks associated with driver fatigue. Therefore, understanding and complying with the 16-hour rule is essential for ensuring safety in commercial driving operations.