After completing the required 10 consecutive hours off duty, a commercial freight driver b… — Commercial Driver's License (CDL) General Knowledge Exam

After completing the required $10$ consecutive hours off duty, a commercial freight driver begins a work shift at $06:00$ . The driver's activities throughout the day are recorded as follows:

* $06:00 - 07:00$ : Pre-trip vehicle inspection and cargo loading ( $1.0\text{ hour}$ on duty, not driving)
* $07:00 - 11:30$ : Driving ( $4.5\text{ hours}$ driving)
* $11:30 - 12:00$ : Meal break ( $0.5\text{ hours}$ off duty)
* $12:00 - 15:30$ : Driving ( $3.5\text{ hours}$ driving)
* $15:30 - 17:30$ : Shipper dock delay ( $2.0\text{ hours}$ on duty, not driving)

Assuming no adverse driving conditions apply, what is the maximum number of driving hours remaining for this shift, and by what exact time must driving cease?

A
$3.0\text{ hours}$ , with all driving ending by $20:30$
$2.5\text{ hours}$ , with all driving ending by $20:00$ Answer
C
$3.0\text{ hours}$ , with all driving ending by $20:00$
D
$1.5\text{ hours}$ , with all driving ending by $19:00$

Answer

2.5\text{ hours}

, with all driving ending by

20:00

The shift began at 06:00, making the 14-hour consecutive duty window expire precisely at 20:00. At 17:30, only 2.5 hours remain before this cutoff. Although the driver has driven 8.0 hours and has 3.0 hours left under the 11-hour driving limit, the 14-hour window takes precedence, limiting the driver to 2.5 hours of driving, all of which must end by 20:00.

Step-by-Step Solution

Calculate cumulative driving hours completed and remaining capacity under the 11-hour driving rule.

Accumulated driving

= 4.5\text{ hours} + 3.5\text{ hours} = 8.0\text{ hours}

. Remaining driving capacity

= 11.0 - 8.0 = 3.0\text{ hours}

Property-carrying drivers are permitted a maximum of 11 hours of driving following 10 consecutive hours off duty.

Calculate the expiration time of the 14-hour consecutive driving window.

Window start time is

06:00

; expiration is

06:00 + 14\text{ hours} = 20:00

The 14-hour consecutive duty window starts when the driver comes on duty and runs continuously regardless of off-duty breaks or dock delays.

Determine the remaining time available inside the 14-hour window from the current time (

17:30

Available window time

= 20:00 - 17:30 = 2.5\text{ hours}

No driving is permitted after the 14th consecutive hour from coming on duty.

Apply the most restrictive limit between remaining driving capacity and remaining duty window time.

\min(3.0\text{ hours driving limit}, 2.5\text{ hours window limit}) = 2.5\text{ hours}

, ending at

20:00

Even though 3.0 hours remain under the 11-hour driving rule, the 14-hour window limits driving to at most 2.5 hours before 20:00.

Key Concept

Interaction between the 11-hour maximum driving limit and the non-extendable 14-hour consecutive duty window.

Estimated Time:2m 0s

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