Final answer:
Commercial drivers cannot drive after accumulating 60 hours on-duty over seven consecutive days or 70 hours on-duty over eight consecutive days, as per FMCSA regulations.
Step-by-step explanation:
The question pertains to the regulations for commercial motor vehicle drivers regarding on-duty hours within a seven-day cycle. According to Federal Motor Carrier Safety Administration (FMCSA) regulations, commercial drivers are not permitted to drive after accumulating 60 hours on-duty over seven consecutive days, or 70 hours on-duty over eight consecutive days, depending on the company's operating hours. This law is enacted to ensure drivers have adequate rest and to prevent driver fatigue, which could lead to accidents.
When discussing experimental design and ethics, a relevant study included professional drivers and their ability to drive after varying levels of sleep, showing the importance of rest for safe driving. The LibreTexts excerpt implies that in some professions, seven hours is the expected work duration, highlighting the contrast to driving regulations that restrict the number of work hours within a week for safety reasons.