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Difficulty: MediumHours of Service (HOS) Regulations

An interstate truck operator reports for duty at 04:00 following a full 10-consecutive-hour off-duty period. Between 04:00 and 12:00, the operator completes 6 hours of driving and 2 hours of on-duty vehicle loading, then immediately logs a qualifying 30-minute off-duty rest break ending at 12:30. Assuming no further off-duty interruptions occur, what is the maximum number of driving hours the operator can legally complete before the shift's driving window expires?

  1. A
    5.5 hours5.5\text{ hours}
  2. 5 hours5\text{ hours}Answer
  3. C
    6 hours6\text{ hours}
  4. D
    2 hours2\text{ hours}

Answer

5 hours5\text{ hours}
Under Hours of Service regulations for property-carrying vehicles, a driver may drive a maximum of 11 hours within a consecutive 14-hour window after 10 consecutive hours off duty. Having already accumulated 6 hours of driving, the operator has 11−6=5 hours11 - 6 = 5\text{ hours} of driving remaining. Because 5.5 hours remain in the 14-hour duty window (04:00 to 18:0004:00\text{ to }18:00, with 8.5 hours elapsed at 12:30), the operator can legally drive for the entire 5 available hours.

Step-by-Step Solution

1
Calculate the end time of the consecutive 14-hour duty window.
The 14-hour window begins at 04:00 and closes strictly at 18:00.
Under FMCSR property-carrying rules, the 14-hour duty window runs consecutively and is not paused or extended by off-duty breaks.
2
Determine total elapsed shift time and remaining window duration at 12:30.
Total elapsed time is 8.5 hours (8 hours on duty + 0.5 hours break), leaving 14−8.5=5.5 hours14 - 8.5 = 5.5\text{ hours} in the duty window.
All driving must occur within the 14-hour window from the start of the duty period.
3
Calculate remaining driving hours permitted under the 11-hour daily driving cap.
Having accumulated 6 hours of driving, the operator has 11−6=5 hours11 - 6 = 5\text{ hours} of allowable driving remaining.
A property-carrying driver may drive a maximum of 11 total hours after 10 consecutive hours off duty.
4
Compare remaining allowable driving hours against the remaining window time.
The operator can complete the full remaining 5 hours of driving because 5.5 hours remain in the window.
The driver is constrained by the 11-hour driving limit, as 5 hours≤5.5 hours5\text{ hours} \le 5.5\text{ hours}.

Key Concept

Property-carrying commercial drivers are limited to a maximum of 11 driving hours within a 14-consecutive-hour duty window following 10 consecutive hours off duty.
Estimated Time:1m 15s
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Topics

Hours of Service (HOS) Regulations

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