Final answer:
Commercial drivers must not drive after accumulating 70 hours on duty in a 7-day cycle, as regulated by DOT to promote safety. The correct option is C).
Step-by-step explanation:
You cannot drive a commercial vehicle after accumulating 70 hours on duty in a 7-day cycle. This regulation is in place to ensure that commercial drivers have adequate rest and to prevent fatigue, which could lead to dangerous driving situations. It's part of Hours of Service (HOS) regulations governed by the Department of Transportation (DOT).
For example, if a truck driver follows these regulations, they must take a rest after reaching the maximum of 70 on-duty hours within any 7-day period.
On-duty hours include all time from the moment a driver begins to work or is required to be in readiness to work until the driver is relieved from work and all responsibility for performing work. Option C) is the correct one.