14-Hour Rule Guide

Who This Applies To

• Property-carrying CMV drivers who need to understand how the 14-hour on-duty window limits when they can drive.
• Drivers who hit the end of their 14-hour window unexpectedly and need to know why driving must stop even if they haven't used all 11 driving hours.
• Dispatchers planning loads who need to understand the difference between the 11-hour driving limit and the 14-hour on-duty window.
• Carriers conducting HOS compliance training who need a clear explanation of how the 14-hour clock interacts with the 11-hour driving limit.

What To Verify

• That the 14-hour clock starts the moment the driver goes on duty for the first time after a 10-hour off-duty period — including any pre-trip inspection, fueling, or paperwork done before the first drive. The clock does not pause for breaks taken within the window.
• That a driver cannot drive after the 14th hour from the start of the on-duty period, even if they haven't used all 11 hours of driving time. The 14-hour window is a hard limit on when driving can occur, not just a timer on driving time.
• That rest breaks taken within the 14-hour window do not extend it. A 30-minute break 4 hours into the shift does not push the end of the 14-hour window to hour 14.5 — the window still ends 14 hours from when the driver first went on duty.
• The exception for the sleeper berth split provision, which modifies how the 14-hour window is calculated under specific conditions. Verify the current sleeper berth split rules in 49 CFR Part 395.

Step-by-Step Overview

1. At the start of each shift, note the exact time of the first on-duty status entry. This is when the 14-hour clock starts.
2. Calculate the 14-hour window endpoint: add 14 hours to the shift start time. All driving must stop at or before this point.
3. Track both driving hours used (against the 11-hour limit) and the time remaining in the 14-hour window. Dispatching decisions should account for both constraints.
4. If a load cannot be completed before the 14-hour window closes, plan a stop before the window ends — do not push past the 14-hour limit to finish a delivery.
5. After 10 consecutive hours off duty, the 14-hour clock resets. Do not attempt to drive if the prior 14-hour window has closed and the required off-duty period has not been completed.

Common Mistakes

• Treating the 14-hour window as extending by the length of any breaks taken. Breaks do not pause the 14-hour clock — a 30-minute lunch break at hour 6 still leaves the window closing at hour 14 from shift start.
• Confusing the 11-hour driving limit with the 14-hour window. A driver could theoretically reach the 14-hour limit without using all 11 driving hours — both limits operate independently and the driver must stop when either is reached.
• Starting the shift clock incorrectly. The 14-hour window starts at the first on-duty entry — which includes pre-trip inspection, not just the first time the truck moves.
• Dispatching based on driving time alone without accounting for the 14-hour window. A driver with 3 driving hours remaining but only 2 hours left in the 14-hour window cannot legally drive 3 more hours.