The 11-hour and 14-hour rules: how the two clocks work together

The 11-hour rule limits how long you drive, and the 14-hour rule limits when you may drive. After 10 consecutive hours off duty, a property-carrying driver may drive up to 11 hours, but only within the 14 consecutive hours that follow coming on duty. Both limits apply at the same time, and whichever runs out first ends your driving for the shift.

What each clock measures

The two clocks count different things, which is why they so often disagree.

• The 11-hour clock counts driving time only. Under 49 CFR 395.2, driving time is all time at the controls of a commercial motor vehicle in operation. It stops while you load, fuel, inspect or rest.
• The 14-hour clock counts elapsed time. Under 395.3(a)(2), you may not drive after 14 consecutive hours from coming on duty following 10 consecutive hours off duty. It keeps running through driving, work and rest alike.

When the 14-hour window closes, you can still do on-duty work that isn't driving, such as paperwork or a post-trip inspection. You just can't drive, and that work counts toward your 60/70-hour total.

When the 14-hour clock starts

The window opens at your first on-duty activity after 10 consecutive hours off, not when the wheels start turning. If you start your pre-trip inspection at 5:00 a.m. and pull out at 5:30, your window closes at 7:00 p.m.

Both clocks start over only after 10 consecutive hours off duty, 10 consecutive hours in the sleeper berth, a consecutive combination of the two, or a qualifying sleeper berth split.

What does not extend the 14-hour window

FMCSA's summary of the rules puts it directly: off-duty time does not extend the 14-hour period. That includes time you might expect to count as rest:

• A 30-minute break, even when it's logged off duty
• Meal stops and showers
• Waiting at a shipper or receiver, on duty or off duty
• Fuel stops, scale stops and inspections
• Sitting in traffic

What does pause or extend it

Two provisions change the 14-hour math, and they work differently.

Qualifying sleeper berth periods are the only time left out of the window. Under 395.1(g)(1), you may split your 10 hours into two periods if one is at least 7 consecutive hours in the sleeper berth, the other is at least 2 consecutive hours (in the berth or off duty), and together they total at least 10 hours. Under 395.1(g)(1)(iii)(B), the 14-hour window does not include those qualifying rest periods. A short period only qualifies once it's paired with the other one.

Adverse driving conditions extend the limits without pausing anything. Under 395.1(b)(1), if you meet conditions as defined in 395.2 (snow, ice, sleet, fog, other adverse weather, or unusual road or traffic conditions you couldn't reasonably have known about before starting), you may drive up to 2 extra hours to finish the run or reach a safe place. FMCSA's summary states that this applies to both the 11-hour limit and the 14-hour window. See the adverse driving conditions guide.

Worked example: when the 14 ends the day

A driver comes on duty at 5:00 a.m. after 10 consecutive hours off.

1. 5:00 to 5:30 a.m.: pre-trip inspection, on duty not driving. The window will close at 7:00 p.m.
2. 5:30 to 9:30 a.m.: drives 4 hours.
3. 9:30 a.m. to 1:30 p.m.: waits at the shipper and gets loaded, 4 hours on duty not driving.
4. 1:30 to 7:00 p.m.: drives 5 hours 30 minutes, for 9 hours 30 minutes of driving in total.
5. 7:00 p.m.: the 14-hour window closes, so driving stops here.

The 11-hour clock still shows 1 hour 30 minutes of driving left, but the driver can't use it until after another 10 consecutive hours off duty. The 4-hour wait also counted as the 30-minute break, so the 5 hours 30 minutes after loading stays well under the 8-hour mark.

The same day with a sleeper berth split

Now say the shipper releases the driver to the sleeper berth from 9:30 a.m. to 12:30 p.m., and loading runs from 12:30 to 1:30 p.m.

1. The 3 hours in the berth can be the shorter half of a split, as long as the driver later takes at least 7 consecutive hours in the sleeper berth.
2. Once paired, those 3 hours don't count against the window, so it closes at 10:00 p.m. instead of 7:00 p.m.
3. Driving before and after the 3-hour period can't exceed 11 hours combined. With 4 hours driven before it, the driver has 7 hours available after it.
4. The driver drives from 1:30 to 8:30 p.m., reaching 11 hours of driving, then goes into the sleeper berth from 8:30 p.m. to 3:30 a.m. That 7-hour period completes the pair.

At 3:30 a.m. the clocks are recalculated from the end of the first period at 12:30 p.m. The driver has 4 hours of driving left (11 minus the 7 driven since 12:30 p.m.) and must finish it by 9:30 a.m. The sleeper berth split guide covers more pairings.

Common mistakes

• Starting the 14 at the first mile. The window opens with your first on-duty activity, including the pre-trip.
• Going off duty to save the clock. Off-duty time at a dock, restaurant or rest area keeps the 14 running.
• Planning around 11 hours of driving on a day with long waits. When you spend hours at a dock, the 14 usually runs out first.
• Driving past the original 14th hour on the strength of a short sleeper period, then not completing the pair. Without the 7-hour period, the short rest doesn't qualify and the late driving falls outside the window.
• Forgetting the 30-minute break. You also need a 30-minute interruption after 8 hours of driving, explained in the 30-minute break rule guide.

How Fort Route helps

Fort Route's trip planner works both clocks for you. You enter the drive and shift time you have left (there is no ELD sync), and the planner checks the route against the 11-hour, 14-hour, 8-hour break and 70-hour rules. It places 30-minute breaks and 10-hour resets at real truck stops and rest areas, and its legal arrival time already includes them.

On the road, the Drive and Shift hours rings show what's left on each clock, so you can see which one will end your day. Fort Route is a planning aid; your ELD record is the legal record of your hours.