Under the Federal Motor Carrier Safety Administration’s hours-of-service rules, time a driver spends waiting at a shipper or receiver is on-duty not driving time, so it runs the 14-hour driving window and counts toward the weekly on-duty cap even though the truck isn’t moving. FMCSA detention time and hours of service intersect at 49 CFR Part 395: the regulations don’t use the word “detention,” but they define the wait, and they make every minute of it count.1eCFR. 49 CFR 395.2 – Definitions
How Detention Time Is Classified Under Federal Rules
49 CFR 395.2 defines on-duty time to include all time at a shipper’s or carrier’s facility waiting to be dispatched, all time loading or unloading, all time supervising or attending a vehicle being loaded, and all time remaining in readiness to operate the vehicle. Unless the carrier has formally relieved you from duty, a wait at a dock is on-duty not driving. That is true whether the wait is 20 minutes or five hours.1eCFR. 49 CFR 395.2 – Definitions
Industry practice treats the first two hours at a facility as a grace period before a driver or carrier bills for detention, but that convention is a billing rule, not a regulatory one. From the FMCSA’s perspective, the clock starts when you arrive.
What Detention Does to the 14-Hour Window
Once you come on duty after 10 consecutive hours off, a 14-hour clock starts. You cannot drive after that 14 consecutive hours have passed, and the window does not pause for a loading delay. Inside the window, you have 11 hours of actual driving available.2eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles
This is where detention hits hardest. A driver who goes on duty at 6:00 a.m. and sits at a shipper until 10:00 a.m. has spent four hours of the 14-hour window before the wheels have moved. The window still closes at 8:00 p.m. that evening. Any driving that would have happened after 8:00 p.m. is now out of legal reach, no matter how many of the 11 driving hours are still unused.
The 30-Minute Break Can Overlap With a Wait
Property-carrying drivers cannot continue driving after 8 cumulative hours of driving time without a 30-minute interruption. The break can be off-duty, sleeper berth, or on-duty not driving, or any combination that produces 30 consecutive minutes.2eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles
So a detention period does satisfy the 30-minute break if it lasts long enough and runs uninterrupted. The 30 minutes must be consecutive; a series of short interactions with a dock worker that keep pulling you back on-duty driving status won’t do it.
Weekly Caps and the 34-Hour Restart
Detention hours accumulate against the weekly on-duty limit the same way driving hours do. Carriers that operate every day of the week face a 70-hour cap over any 8 consecutive days; carriers that don’t run every day face 60 hours over 7 consecutive days.2eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles
You can restart the 7- or 8-day period by taking at least 34 consecutive hours off duty.3eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles A driver who loses a big block of the week to dock waits sometimes has to take that restart earlier than planned.
Protecting the 14-Hour Window With the Split Sleeper Berth
When you know a wait will be long, the split sleeper berth provision is the one active tool available to preserve driving hours. You can divide the required 10 hours of rest into two qualifying periods: at least 7 consecutive hours in the sleeper berth paired with at least 2 consecutive hours off duty, with the two periods together totaling at least 10 hours.4Federal Motor Carrier Safety Administration. What Rest Periods Qualify for the Split Sleeper Berth Provision
A qualifying period is excluded from the 14-hour window calculation. If you arrive at a facility and learn you’re facing a seven- or eight-hour wait, taking that time in the sleeper berth can keep those hours from consuming your driving day. The arithmetic is fiddly, but the idea is simple: sleep during the wait, not after it, and the hours you spend in the berth stop counting against you.
Personal Conveyance After You’re Released
When the shipper or receiver finally releases you, moving to a nearby safe rest location can be logged as personal conveyance (off-duty) rather than driving. FMCSA guidance permits this when the driver is traveling to the first reasonable, safe location to obtain required rest after loading or unloading, provided the carrier has relieved the driver from all work responsibilities.5Federal Motor Carrier Safety Administration. Personal Conveyance
A loaded trailer is fine. What isn’t allowed is using personal conveyance to advance the load, such as driving back to the carrier’s terminal after unloading. That trip is for the carrier’s benefit and must be logged as driving time.5Federal Motor Carrier Safety Administration. Personal Conveyance You also need enough remaining time to actually get the required off-duty rest once you reach the location.
The Oilfield Exception, and Why It Rarely Helps
One narrow carve-out exists. Specially trained drivers operating vehicles specially constructed to service oil or gas wells may log waiting time at the well site as off duty, and that time does not count against the 14-hour window. The driver must annotate the record of duty status to identify the periods that are actually waiting time.6eCFR. 49 CFR 395.1 – General Applicability and Definitions
This exception applies only to qualifying oilfield operations. Waiting at a warehouse, a distribution center, a plant, a port, or any other type of facility is on-duty not driving under the ordinary rule.
Adverse Driving Conditions
If a detention-shortened day then runs into unexpected weather or a road closure, the adverse driving conditions exception may let you finish the run. When conditions you couldn’t reasonably have anticipated make it unsafe to complete the trip within normal limits, you may drive up to 2 additional hours beyond the 11-hour driving limit and 2 additional hours beyond the 14-hour window.6eCFR. 49 CFR 395.1 – General Applicability and Definitions The exception does not compensate for detention itself. It only addresses driving conditions the driver could not have known about in advance.
Logging Detention Correctly on the ELD
The ELD captures the status change automatically when the truck stops. The wait posts as “On-duty not driving.” Every change in duty status also requires a location entry (city or town and state abbreviation), and the record must show shipping document numbers or the shipper’s name and commodity.7eCFR. 49 CFR 395.8 – Driver’s Record of Duty Status
Use the remarks field. Annotate long waits with the reason so the log distinguishes routine pre-trip activity from an extended facility delay. ELDs record the date, time, vehicle location, engine hours, and miles at each status change automatically, and enforcement officers read the machine-captured data alongside your annotations. Incomplete records are themselves a violation, so the goal is a log that tells a verifiable story of the day.7eCFR. 49 CFR 395.8 – Driver’s Record of Duty Status
What HOS Rules Do Not Cover: Detention Pay
The FMCSA’s authority over detention is limited to safety and how the time is classified and logged. Whether the driver or carrier gets paid for the wait, and how much, is set by the employment contract between driver and carrier or the shipping agreement between carrier and shipper. State wage and hour laws can impose additional requirements on compensation for on-duty waiting time, but that sits outside federal hours-of-service rules.