Hours of Service, Explained Properly
Five limits run at the same time and each one can end your day on its own. Most confusion comes from treating them as one rule instead of five clocks running in parallel.
This page covers property-carrying drivers. Passenger-carrying drivers work to a different set of limits.
The five clocks
| Clock | Limit |
|---|---|
| Driving | 11 hours maximum, after 10 consecutive hours off duty |
| Duty window | No driving beyond the 14th consecutive hour after coming on duty |
| Break | 30 minutes required after 8 cumulative hours of driving without a 30-minute interruption |
| Weekly | No driving after 60 hours on duty in 7 days, or 70 hours in 8 days |
| Restart | The 7 or 8 day period restarts after 34 or more consecutive hours off duty |
The 11 and the 14, and why they are different
The 11-hour clock counts only driving. The 14-hour clock counts everything from the moment you come on duty — driving, loading, waiting at a dock, fuelling, a two-hour lunch. It is consecutive, which is the part that costs people money: once it starts, it does not pause because you stopped working.
The practical consequence: a four-hour wait at a receiver does not extend your day. It eats it. You can finish a 14-hour window having driven six hours, entirely legally, and having earned six hours of pay for fourteen hours of your life. Detention is not just an annoyance in this job; it is the single biggest destroyer of a driver's earning capacity, and the hours rules are why.
The 30-minute break
Required once you have driven 8 cumulative hours without at least a 30-minute interruption. What counts as the interruption is broader than most people assume: it can be off-duty time, sleeper berth time, or on-duty time that is not driving, or a combination. If you spent 45 minutes on the dock at hour six, that already satisfied it.
The sleeper berth split
You may divide the required 10 hours off into two periods:
- One period of at least 7 consecutive hours in the sleeper berth, and
- Another period of at least 2 hours, spent off duty, in the sleeper berth, or a combination of both.
The two periods must add up to at least 10 hours. Neither period counts against your 14-hour window, which is the whole point of using the split: it lets you park out a bad afternoon without burning the day.
A worked example. You come on duty at 06:00 and drive until 12:00 — six hours driving, six hours into the window. You take 3 hours in the sleeper berth from 12:00 to 15:00. That 3-hour period pairs with a later 7-hour berth period, so it does not count against your 14. You resume at 15:00 with five hours of driving left on the 11-hour clock and your window effectively pushed back three hours. Later you take 7 consecutive hours in the berth, which completes the pair and starts a fresh cycle.
Two things go wrong with splits. People take a 6-hour period thinking it qualifies as the long half — it does not, the long half is 7 — and people forget that the pairing must total 10, so 7 plus 2 leaves you an hour short of a full reset unless the shorter period is 3.
Adverse driving conditions
When you encounter adverse driving conditions, you may extend both the 11-hour driving limit and the 14-hour window by up to 2 hours.
The word doing the work is encounter. This provision covers conditions you could not have known about when you dispatched — a snowstorm that was not forecast, an accident closing the interstate. It does not cover a traffic jam you drive into every Tuesday, and it does not cover a forecast blizzard you chose to leave in. Auditors know the difference.
The short-haul exception
If you operate within a 150 air-mile radius of your normal work reporting location, return to it within 14 consecutive hours, and do not exceed that duty period, you are exempt from certain requirements including keeping records of duty status — which in practice means you may not need an ELD.
Air miles are straight-line distance, not road miles, so the radius is larger on the map than it feels. But the exception is all or nothing on the day: exceed it once and you need a record of duty status for that day.
Where the fines actually come from
In our reading of enforcement patterns, small carriers rarely get caught driving 15 hours. They get caught on the paperwork around the edges:
- Unassigned driving time sitting in the ELD account because someone moved a truck in the yard without logging in.
- Form and manner problems — missing shipping document numbers, missing trailer numbers.
- Personal conveyance used wrongly, most often to move toward a delivery rather than away from work.
- Supporting documents that do not match the log, which is what turns a clean audit into a bad one.
Frequently asked questions
Does the 14-hour clock stop if I take a nap?
No, not unless the rest qualifies as part of a sleeper berth pairing. Ordinary off-duty time inside the day does not pause the 14-hour window.
Can on-duty time count as my 30-minute break?
Yes. The break can be satisfied by any 30 consecutive minutes of non-driving time, whether off duty, in the sleeper berth, or on duty not driving.
What is the shortest sleeper berth period that qualifies?
2 hours, as the shorter half of a pairing. The longer half must be at least 7 consecutive hours in the berth, and together they must total at least 10.
Do I need an ELD if I run local?
If you meet the short-haul exception every day — within 150 air miles, back within 14 hours — you are exempt from records of duty status and generally from the ELD requirement. Exceed it and that day needs a record.
Related
- The new entrant safety audit — hours records are one of the six areas examined.
- Cost per mile calculator — detention destroys utilisation, and utilisation drives your cost per mile.
Sources
- Summary of Hours of Service Regulations — FMCSA.
- 49 CFR Part 395 — Hours of Service of Drivers — eCFR.
General information, not legal advice. Regulations change; confirm current requirements with the agency before acting.