Hours of Service (HOS) are the federal rules that decide how long you can drive, how long you can work, and when you have to rest. They run your day whether you like them or not — and misunderstanding them is one of the fastest ways for a new driver to rack up violations.
Here's the plain-English version of the rules that matter most.
Why HOS exists
The rules exist to keep tired drivers off the road. Fatigue is a real safety issue, and the FMCSA sets hard limits on driving and on-duty time to manage it. Your electronic logging device (ELD) tracks it all automatically, so "I forgot" isn't a defense anymore. Learn the rules and they become second nature; ignore them and they'll bite you at a scale house.
The 11-hour driving limit
After 10 consecutive hours off duty, you can drive up to 11 hours. That's your driving budget for the shift. Once you've used 11 hours of driving, you're done driving until you take another 10 off — no matter how much of your workday is left.
The 14-hour window
Here's the one that trips people up. Once you come on duty, you have a 14-hour window to get your 11 hours of driving done. The clock doesn't stop for lunch, fueling, loading, or a two-hour dock wait — it keeps running. Hit hour 14 and you can't drive again until you've taken 10 hours off, even if you haven't used all 11 driving hours.
Managing that 14-hour window — not wasting it sitting at a dock — is a core skill of the job.
The 30-minute break
You need a 30-minute break before you can keep driving once you've hit 8 cumulative hours of driving time. It can be off-duty, in the sleeper, or on-duty-not-driving — anything that isn't driving for 30 straight minutes counts.
The 60/70-hour limit and the 34-hour restart
There's also a weekly cap: you can't drive after 60 hours on duty in 7 days or 70 hours in 8 days, depending on how your carrier operates. When you bump into it, a 34-hour restart — 34 consecutive hours off duty — resets that weekly clock so you can start fresh.
The sleeper-berth split
The sleeper-berth provision lets you split your required 10 hours off. The common splits are 7/3 or 8/2: a longer stretch in the sleeper paired with a shorter off-duty period, which can effectively pause your 14-hour clock when used correctly. It's flexible but easy to get wrong, so learn it carefully before you rely on it.
The ELD and how it tracks you
Your ELD logs your drive time automatically from the truck's engine, and it's what an officer looks at during an inspection. Know how to certify your logs, make duty-status changes, and add annotations. A clean, well-managed log is one of the easiest ways to have short, drama-free inspections.
Common mistakes that cost you
New drivers lose time and points on the same handful of errors:
- Burning the 14-hour clock sitting at a shipper instead of using off-duty or sleeper time.
- Forgetting the 30-minute break and driving past the 8-hour mark.
- Sloppy duty-status changes that make a legal day look illegal on the log.
- Not planning the restart, then getting stuck mid-week with no hours left.
Personal conveyance: off-duty driving that doesn't count
Personal conveyance (PC) lets you move the truck off-duty for personal reasons — like driving to a safe place to park after you're done for the day, or to a nearby restaurant — without it counting against your driving time. It's genuinely useful, but it's also easy to abuse, and officers know it.
The rule of thumb: PC is for your convenience, not for advancing the load. Using PC to creep closer to a delivery is the kind of thing that turns a routine inspection into a violation. Use it honestly and it's a great tool; stretch it and it becomes a liability.
The adverse driving conditions exception
When you hit unexpected conditions you couldn't have known about — a sudden snowstorm, a major crash closing the highway — the adverse driving conditions exception can extend both your 11-hour driving limit and your 14-hour window by up to 2 hours. It's meant for genuine surprises, not for weather you could have planned around or a shipper who loaded you late. Document what happened, and use it for what it's for.
FAQ
How many hours can a truck driver drive in a day?
Up to 11 hours of driving, but only within a 14-hour on-duty window that starts when you come on duty and doesn't stop for breaks.
What is the 34-hour restart?
Thirty-four consecutive hours off duty that resets your 60- or 70-hour weekly limit, letting you start a fresh week of available hours.
Does the 14-hour clock stop when I take a break?
No. The 14-hour window keeps running through breaks, fueling, loading and waiting. Only a qualifying sleeper-berth split can effectively pause it.
Bottom line: learn the 11, the 14, the 30-minute break and the restart cold — they run your day. Master them and you'll drive legal, clean, and stress-free. Ready to roll? Browse trucking jobs.
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