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ELD and Hours of Service Basics for New CDL Drivers

Your first weeks with a CDL-A, nobody cares how fast you back into a dock as much as whether your logs are clean. Hours of service (HOS) are the federal rules that cap how long you can drive and work before you have to rest. Your electronic logging device (ELD) keeps score. Learn them early and you'll avoid violations, out-of-service orders and arguments with dispatch.

This guide covers the federal rules for property-carrying drivers (freight, not passengers) running interstate. It's a plain-English summary, not legal advice. The official source is the FMCSA Summary of Hours of Service Regulations and 49 CFR Part 395. Some states have their own rules for intrastate driving, and your carrier may have stricter policies.

Start With 10 Hours Off

Every work shift starts after at least 10 consecutive hours off duty. That reset is what gives you a fresh 11-hour driving limit and a fresh 14-hour window.

The 11-Hour Driving Limit

After 10 hours off, you can drive a maximum of 11 hours. Once you hit 11 hours of driving, you're done driving until you take another 10 consecutive hours off (or the sleeper berth equivalent below). You can still do other work, like paperwork, but you can't drive.

The 14-Hour Window

The clock that catches most new drivers. Once you come on duty, you have 14 consecutive hours in which to do your driving. After the 14th hour, you can't drive again until you've had 10 hours off.

The key part: off-duty time does not stop the 14-hour clock. A two-hour lunch or a long wait at a shipper still burns your window. Come on duty at 6:00 a.m. and you can't drive after 8:00 p.m., no matter how much of that day you spent waiting. That's why detention time matters so much to your paycheck and your schedule.

The 30-Minute Break

You need a 30-minute break after 8 cumulative hours of driving without at least a 30-minute interruption. The break can be off duty, sleeper berth, on duty not driving (like fueling or unloading), or any combination, as long as it's 30 minutes in a row. Short breaks can't be added up.

The break doesn't add driving time and it counts against your 14-hour window.

The 60/70-Hour Limit

On top of the daily limits there's a rolling weekly limit. You can't drive after 60 hours on duty in 7 consecutive days, or 70 hours in 8 consecutive days if your carrier runs trucks every day of the week. This counts all on-duty time, not just driving. Your ELD tracks your remaining hours, often called your "recap."

The 34-Hour Restart

You can reset your 60/70-hour clock by taking 34 or more consecutive hours off duty. After a qualifying restart, your 7- or 8-day period starts over. Whether your carrier expects you to use restarts is a good question for the recruiter, especially on OTR jobs.

The Sleeper Berth Provision

If your truck has a sleeper, you can split your 10 hours off into two periods instead of taking them all at once:

  • One period must be at least 7 consecutive hours in the sleeper berth.
  • The other must be at least 2 hours, off duty or in the sleeper.
  • Together they must add up to at least 10 hours (for example, 7/3 or 8/2).

When paired correctly, neither period counts against your 14-hour window. The math of a split gets tricky, so practice it with your trainer or your ELD before you rely on it. FMCSA's Interstate Truck Driver's Guide to Hours of Service walks through worked examples.

Adverse Driving Conditions

If you run into adverse driving conditions, like snow, fog or a road closure you couldn't have known about when you started your trip, you may extend both the 11-hour driving limit and the 14-hour window by up to 2 hours. It's for conditions you couldn't have known about ahead of time, not ordinary rush-hour traffic or a late start. Annotate your log when you use it.

The Short-Haul Exception

Many local drivers don't need an ELD or a full log at all. Under the short-haul exception, a driver who stays within a 150 air-mile radius of the normal work reporting location and returns there within 14 consecutive hours is exempt from the logbook and ELD requirements; the carrier keeps time records instead. Short-haul drivers are also exempt from the 30-minute break. The 11-hour, 10-hour off and 60/70 limits still apply.

What an ELD Does

Most interstate drivers who must keep records of duty status have to use an ELD. The device connects to the truck's engine and automatically records driving time, so you can't fudge driving hours. You still pick your other duty statuses (off duty, sleeper berth, on duty not driving) and certify your logs. At a roadside inspection, the officer can view your logs on the screen or have them transferred.

There are exceptions. Drivers who use the short-haul exception, drivers who keep logs for no more than 8 days in any 30-day period, driveaway-towaway operations, and trucks with engines older than model year 2000 aren't required to use an ELD. See FMCSA's ELD page for the full rule.

Habits That Keep New Drivers Out of Trouble

  • Watch your 14, not just your 11. Plan your day around when the window closes.
  • Log on-duty work honestly. Pre-trips, fueling and loading count. Putting them off duty is a violation.
  • Know your ELD. Learn how to change status, add notes, certify logs and show an officer your logs before your first solo run.
  • Keep the instruction sheet and paper logs in the cab. If the ELD malfunctions, you're expected to switch to paper and tell your carrier.
  • Ask about detention and HOS before you take a job. A carrier that respects your clock makes life easier.

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