Hours of Service and Fatigue Management
Hours of Service and Fatigue Management
This domain tests the federal hours-of-service limits that apply to many CMV drivers, plus the judgment to recognize and manage fatigue. The exam focuses on the 11-hour, 14-hour, and 60/70-hour rules.
Core rules
- After 10 consecutive hours off duty, a driver may drive up to 11 hours. Driving must be completed within a 14-hour on-duty window. The 14-hour window is not extended by meal breaks or other off-duty time.
- A driver must take a 30-minute break after 8 cumulative hours of driving without at least 30 minutes of non-driving time. The 60-hour/7-day and 70-hour/8-day limits apply, depending on the operation. A 34-hour restart can reset the weekly cycle when eligible.
- Use an ELD or paper log as required, record duty status accurately, and retain supporting documents. Fatigue management means sleep before driving, planned breaks, and stopping when drowsy.
Worked example
A driver reports at 06:00 and takes a 2-hour off-duty lunch at noon. By 20:00 the 14-hour window has closed, even though the driver has not used all 11 driving hours. The driver cannot simply subtract the lunch and keep driving. Reasoning: the 14-hour clock runs from the start of duty and is not paused by off-duty time.
Traps that cost marks
Thinking a lunch break extends the 14-hour window; confusing the 11-hour driving limit with the 14-hour duty window; using the 34-hour restart incorrectly; and falsifying logs to hide fatigue.