Hours of service, explained for a new driver

Three clocks run at once the moment you go on duty: an 11-hour driving clock, a 14-hour window, and a 60- or 70-hour weekly total. Learn those three and almost everything else in the hours-of-service rules is an exception to them. The limits live in 49 CFR Part 395 and have not changed since the rewrite that took effect in September 2020.

The three clocks

You start every one of them the same way: with 10 consecutive hours off duty. Until you have taken those 10 hours, you may not drive at all.

Clock	The limit	What it counts	How it resets
Driving	11 hours	Only time behind the wheel, moving	10 consecutive hours off duty
On-duty window	14 consecutive hours	Everything from the moment you go on duty — driving, loading, fueling, inspections, waiting at a dock	10 consecutive hours off duty
Weekly	60 hours in 7 days, or 70 hours in 8 days	All on-duty time, rolling	34 or more consecutive hours off duty (optional)

Which weekly limit applies to you depends on your carrier, not on you. A company that runs vehicles every day of the week uses 70 in 8. A company that does not operate every day uses 60 in 7. Ask on day one which one you are on, because the answer changes how many days you can work before you sit.

The 34-hour restart is optional. If you never take one, the weekly clock just keeps rolling — the hours you worked eight days ago drop off, and you get them back.

The 14-hour window is what actually ends your day

New drivers watch the 11-hour clock and get caught by the 14. The 14-hour window is consecutive. It does not stop for lunch, it does not stop for a two-hour wait at a receiver, and it does not stop while you sit in a fuel island line. Once 14 hours have passed since you came on duty, you cannot drive again until you have had 10 consecutive hours off, even if you only drove six of them.

This is the single biggest reason drivers feel like they are running out of time on a load that looked easy on paper. Detention at a shipper burns your 14 and nobody pays you for it. Understanding that trade-off early is part of understanding how driver pay actually works — the clock and the paycheck are connected.

The 30-minute break

After 8 cumulative hours of driving time without a break of at least 30 consecutive minutes, you have to take one before you drive again. It is 8 hours of driving, not 8 hours since you started the day.

The break itself can be off duty, sleeper berth, or on-duty not driving. That last one matters: if you spend 45 minutes on a dock in on-duty status and do not touch the wheel, that satisfies it. You do not have to go off duty to take your 30.

Splitting the 10 hours in a sleeper berth

The sleeper berth provision at 395.1(g) lets you break your 10 hours off into two pieces instead of one. To qualify:

• One period must be at least 7 consecutive hours in the sleeper berth.
• The other period must be at least 2 consecutive hours, off duty or in the sleeper.
• The two together must total at least 10 hours.

When a pair qualifies, neither period counts against your 14-hour window. That is the whole point of the split — it effectively pauses the 14. The common versions are 8 and 2 or 7 and 3. A 6-and-4 split does not work, because neither piece reaches 7 hours in the berth.

The arithmetic gets confusing fast, and your electronic logging device will do it for you. Learn the rule anyway, because the ELD only tells you what happened, not what to plan.

Two exceptions worth knowing

Short-haul. If you operate within a 150 air-mile radius of your normal work reporting location, start and return to that same location, and are released from duty within 14 consecutive hours, you are exempt from keeping a record of duty status under 395.8 — which in practice means no ELD. The 11-hour driving limit and the 10 hours off still apply. Your carrier has to keep time records for six months. This is why a lot of local and regional work runs on a time clock instead of a log.

Adverse driving conditions. Snow, fog, an unexpected highway shutdown — conditions you could not have known about when you dispatched — let you extend both the 11-hour driving limit and the 14-hour window by up to two hours. Heavy traffic you should have expected does not count, and inspectors know the difference. Annotate your log with what happened.

What happens when you go over

An hours-of-service violation found at a roadside inspection is not a ticket you pay and forget. If you are over your driving limit, an officer will place you out of service on the spot under 395.13 — you sit where you are, usually for 10 consecutive hours, before you move the truck. The violation then attaches to your carrier's Hours-of-Service Compliance record and to your own inspection history, which the next company that considers hiring you can pull. That is covered in more detail in the guides on what a roadside inspection actually involves and what follows you between carriers.

Falsifying a log is treated as a separate and more serious matter than running over your hours. With an ELD recording engine data, the falsification is usually easier to prove than the original violation.

This article describes federal regulation. It is not legal advice, and if you are facing a violation with real consequences, talk to someone who represents drivers.

What to do next

Before you interview anywhere, ask the recruiter one question: is this job 60 in 7 or 70 in 8, and does it run under the short-haul exception? The answer tells you more about what your week will look like than the cents-per-mile figure does. It is also worth reading FMCSA's own summary of the hours-of-service rules — it is one page, it is free, and it is the source your carrier's safety department is working from too.

If you have not started training yet, the hours rules are part of the ELDT theory you will cover in week one. You can start your application and pick a class start date whenever you are ready; classes begin every Monday.