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Difficulty: HardHours of Service (HOS) Regulations

A property-carrying commercial motor vehicle driver operates for a motor carrier that runs vehicles every day of the week under the 70-hour/8-day rule. Over the preceding 7 consecutive days, the driver accumulated a total of 58 on-duty hours. On Day 8, following a qualifying 10-consecutive-hour off-duty rest period, the driver logs the following duty statuses:

- 05:00 – 06:00 (1.0 hour): On-duty (not driving) for pre-trip vehicle inspection and cargo loading
- 06:00 – 10:00 (4.0 hours): Driving
- 10:00 – 11:30 (1.5 hours): Off-duty (meal and rest break)
- 11:30 – 14:00 (2.5 hours): Driving
- 14:00 – 15:30 (1.5 hours): On-duty (not driving) for unloading and documentation

At 15:30, what is the maximum number of additional driving hours this driver may legally operate before reaching a regulatory limit?

  1. 3.0 hoursAnswer
  2. B
    3.5 hours
  3. C
    4.5 hours
  4. D
    2.0 hours

Answer

3.0 hours
Under federal Hours of Service regulations, a property-carrying driver must satisfy the 11-hour driving limit, the 14-hour on-duty window, and the cumulative weekly duty cycle limit simultaneously. By 15:30, the driver has accumulated 6.5 driving hours (leaving 4.5 hours of driving permitted), elapsed 10.5 hours of the 14-hour shift window (leaving 3.5 hours before the window closes at 19:00), and accumulated 9.0 on-duty hours on Day 8. Adding 9.0 hours to the prior 58.0 hours yields 67.0 cumulative on-duty hours, leaving exactly 3.0 hours before reaching the strict 70-hour ceiling. Because driving is an on-duty function, the driver cannot drive more than 3.0 hours.

Step-by-Step Solution

1
Calculate remaining driving hours under the daily 11-hour maximum driving rule.
The driver has driven 4.0 hours + 2.5 hours = 6.5 hours. Remaining driving allowance: 11.0 - 6.5 = 4.5 hours.
Federal regulations restrict property-carrying drivers to a maximum of 11 hours of total driving time within a work shift.
2
Calculate remaining available time in the daily 14-hour consecutive duty window.
The shift began at 05:00, setting the 14-hour window expiration at 19:00. At 15:30, elapsed time is 10.5 hours. Remaining window time: 14.0 - 10.5 = 3.5 hours.
Driving is prohibited after the 14th consecutive hour following the start of duty.
3
Calculate accumulated on-duty time on Day 8 and available hours under the 70-hour/8-day cumulative limit.
Day 8 on-duty time = 1.0 (inspection) + 4.0 (driving) + 2.5 (driving) + 1.5 (unloading) = 9.0 hours. (Off-duty time of 1.5 hours does not count). Total 8-day cumulative on-duty hours = 58.0 + 9.0 = 67.0 hours. Remaining available on-duty hours: 70.0 - 67.0 = 3.0 hours.
A driver operating under the 70-hour/8-day rule cannot drive once 70 on-duty hours have accumulated in any rolling 8-consecutive-day period.
4
Determine the most restrictive limit governing driving eligibility.
Comparing the limits (11-hour driving rule: 4.5 hours; 14-hour duty window: 3.5 hours; 70-hour weekly rule: 3.0 hours), the binding limit is 3.0 hours.
A commercial driver must comply with all overlapping Hours of Service limits simultaneously, meaning the lowest remaining value establishes the legal maximum.

Key Concept

Application of overlapping Hours of Service constraints (11-Hour Driving Rule, 14-Hour Duty Window, and 70-Hour/8-Day Cumulative Limit)
Estimated Time:2m 0s
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Topics

Hours of Service (HOS) Regulations

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