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Difficulty: MediumHours of Service (HOS) Regulations

A regional transport driver logs into the electronic logging device at 08:30 after completing 10 consecutive hours off duty. During the shift, the driver completes the following activities:

• 3 hours3\text{ hours} of vehicle inspection and cargo loading (on-duty, not driving)
• 4 hours4\text{ hours} of driving
• 1.5 hours1.5\text{ hours} of off-duty lunch break
• 2.5 hours2.5\text{ hours} of unloading assistance at a customer facility (on-duty, not driving)

Assuming no adverse conditions or sleeper berth exceptions apply, what is the maximum number of driving hours the driver has remaining before reaching a mandatory shut-down?

  1. A
    7 hours7\text{ hours}
  2. 3 hours3\text{ hours}Answer
  3. C
    4.5 hours4.5\text{ hours}
  4. D
    5.5 hours5.5\text{ hours}

Answer

The driver has a maximum of 3 hours3\text{ hours} of driving time remaining.
The driver has accumulated 11 hours11\text{ hours} of total elapsed shift time (3+4+1.5+2.5=113 + 4 + 1.5 + 2.5 = 11). Because the 14-hour duty window runs continuously and cannot be extended by standard off-duty breaks, there are only 3 hours3\text{ hours} remaining in the driving window (14−11=314 - 11 = 3). Even though the driver has 7 hours7\text{ hours} left under the 11-hour driving cap (11−4=711 - 4 = 7), the driver cannot operate a commercial motor vehicle past the 14-hour mark.

Step-by-Step Solution

1
Calculate the total elapsed time since the beginning of the work shift to determine the status of the 14-hour driving window.
3 hours (loading)+4 hours (driving)+1.5 hours (off-duty)+2.5 hours (unloading)=11 total elapsed hours3\text{ hours (loading)} + 4\text{ hours (driving)} + 1.5\text{ hours (off-duty)} + 2.5\text{ hours (unloading)} = 11\text{ total elapsed hours}
Under Hours of Service rules, the 14-hour driving window runs consecutively from the start of the shift and is not extended or paused by off-duty breaks or non-driving duty.
2
Calculate the remaining time in the 14-hour consecutive driving window.
14 hours−11 hours=3 hours remaining in window14\text{ hours} - 11\text{ hours} = 3\text{ hours remaining in window}
A commercial driver cannot drive after the end of the 14th consecutive hour after coming on duty.
3
Calculate the remaining driving hours permitted under the 11-hour cumulative driving limit.
11 hours−4 hours already driven=7 hours11\text{ hours} - 4\text{ hours already driven} = 7\text{ hours}
Property-carrying drivers are allowed a maximum of 11 hours of driving time within the duty window.
4
Compare both limiting factors to identify the binding constraint on available driving hours.
min⁡(3 hours in 14-hr window,7 hours under 11-hr rule)=3 hours\min(3\text{ hours in 14-hr window}, 7\text{ hours under 11-hr rule}) = 3\text{ hours}
Driving must cease whenever either the 11-hour driving limit or the 14-hour window is reached, whichever comes first.

Key Concept

The 14-hour consecutive driving window runs continuously and acts as a hard limit on driving time, regardless of remaining hours under the 11-hour driving limit.
Estimated Time:1m 15s
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Topics

Hours of Service (HOS) Regulations

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