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Difficulty: MediumHours of Service (HOS) Regulations

A commercial motor vehicle driver begins a shift at 07:30 following 10 consecutive hours off duty. Between 07:30 and 13:30, the driver accumulates 3 hours3\text{ hours} of driving time and 3 hours3\text{ hours} of on-duty (not driving) dock work. The driver then spends the next 3 hours3\text{ hours} (from 13:30 to 16:30) off duty having lunch and resting. If the driver resumes driving at 16:30 without taking any sleeper berth periods, what is the maximum number of additional driving hours permitted before reaching the mandatory cutoff?

  1. A
    8 hours8\text{ hours}
  2. 5 hours5\text{ hours}Answer
  3. C
    2 hours2\text{ hours}
  4. D
    7 hours7\text{ hours}

Answer

5 hours5\text{ hours}
The 14-hour driving window begins at 07:30 and runs consecutively until 21:30. When resuming driving at 16:30, only 5 hours5\text{ hours} remain before 21:30. Even though the driver has 8 hours8\text{ hours} remaining under the 11-hour driving limit (11−3=811 - 3 = 8), no commercial driving is permitted after the 14-hour window closes.

Step-by-Step Solution

1
Determine the expiration time of the 14-hour driving window.
The 14-hour window begins at 07:30 and ends at 21:30.
Under standard property-carrying regulations, the 14-hour driving window runs consecutively from the start of the shift and is not paused or extended by off-duty breaks.
2
Calculate remaining time in the 14-hour window when the driver resumes duty at 16:30.
21:30−16:30=5 hours21:30 - 16:30 = 5\text{ hours}.
A driver cannot operate a commercial motor vehicle after the 14th consecutive hour has elapsed.
3
Calculate remaining driving time available under the 11-hour driving limit.
11 hours−3 hours=8 hours11\text{ hours} - 3\text{ hours} = 8\text{ hours}.
The driver has driven 3 hours3\text{ hours} toward the maximum limit of 11 hours11\text{ hours}.
4
Identify the limiting regulatory constraint.
min⁡(5 hours,8 hours)=5 hours\min(5\text{ hours}, 8\text{ hours}) = 5\text{ hours}.
Driving must cease as soon as the earliest limit (the 14-hour window) is reached.

Key Concept

The 14-hour driving window runs consecutively and is not paused by routine off-duty breaks, thereby capping total remaining driving time once the window expires.
Estimated Time:1m 15s
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Hours of Service (HOS) Regulations

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