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Zorluk: OrtaHours of Service (HOS) Regulations

A truck driver starts a shift at 04:00 after completing 10 consecutive hours off duty. During the shift, the driver spends 1 hour on pre-trip inspections and paperwork, drives for 6.5 hours, takes a 45-minute off-duty meal break, and waits for 3 hours on duty at a shipper facility. At 15:15, the driver is ready to resume driving. Assuming standard property-carrying rules with no adverse driving conditions, what is the maximum number of additional driving hours the driver may log before being required to take another 10 consecutive hours off duty?

  1. A
    4.5 hours4.5\text{ hours} (4 hours 30 minutes4\text{ hours } 30\text{ minutes})
  2. B
    3.5 hours3.5\text{ hours} (3 hours 30 minutes3\text{ hours } 30\text{ minutes})
  3. 2.75 hours2.75\text{ hours} (2 hours 45 minutes2\text{ hours } 45\text{ minutes})Cevap
  4. D
    1.75 hours1.75\text{ hours} (1 hour 45 minutes1\text{ hour } 45\text{ minutes})

Cevap

2.75 hours2.75\text{ hours} (2 hours 45 minutes2\text{ hours } 45\text{ minutes})
Under Hours of Service (HOS) regulations for property-carrying vehicles, a driver may drive up to 11 hours, but all driving must occur within a strict 14-consecutive-hour window after coming on duty following 10 consecutive hours off duty. Beginning at 04:00, the driver's 14-hour window strictly closes at 18:00. At 15:15, only 2 hours and 45 minutes (2.75 hours2.75\text{ hours}) remain until the 18:00 cutoff. Although the driver has 4.5 hours remaining under the 11-hour driving rule (11.0−6.5=4.5 hours11.0 - 6.5 = 4.5\text{ hours}), the 14-hour window imposes the stricter limit.

Adım Adım Çözüm

1
Calculate the end of the 14-hour consecutive driving window.
The 14-hour window starts at 04:00 and ends at 18:00 (04:00 + 14:00).
Under FMCSA regulations, property-carrying drivers may not drive after the 14th consecutive hour following 10 consecutive hours off duty. Off-duty breaks do not extend this window.
2
Calculate the time remaining in the 14-hour window at 15:15.
From 15:15 to 18:00 is 2 hours and 45 minutes2\text{ hours and } 45\text{ minutes} (2.75 hours2.75\text{ hours}).
This represents the maximum time available before driving is legally prohibited by the 14-hour rule.
3
Calculate remaining driving hours under the 11-hour driving limit.
11.0 total allowed−6.5 driven=4.5 hours remaining11.0\text{ total allowed} - 6.5\text{ driven} = 4.5\text{ hours remaining}.
Drivers may drive a maximum of 11 hours within the 14-hour window.
4
Determine the governing constraint.
min⁡(2.75 hours,4.5 hours)=2.75 hours\min(2.75\text{ hours}, 4.5\text{ hours}) = 2.75\text{ hours}.
The driver is limited by whichever regulatory threshold is reached first.

Anahtar Kavram

14-Hour Consecutive Duty Window vs. 11-Hour Maximum Driving Limit
Tahmini Süre:1m 30s
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Hours of Service (HOS) Regulations

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