Bobtailing — driving a tractor with no trailer attached — counts against your Hours of Service limits exactly the same as pulling a loaded trailer. The bobtailing Hours of Service rules under 49 CFR Part 395 apply to every minute the tractor is moving, with one narrow exception: time the driver spends using the tractor for a genuinely personal purpose while completely relieved of work can be logged off duty as personal conveyance.1eCFR. 49 CFR Part 395 – Hours of Service of Drivers – Section 395.3 Everything else about bobtailing and HOS follows from that split.
A tractor is a commercial motor vehicle on its own. Its gross vehicle weight rating sits well above the 10,001-pound threshold in 49 CFR 390.5, so unhooking the trailer doesn’t strip away any federal safety obligation.2eCFR. 49 CFR 390.5 – Definitions Note that bobtailing is not the same as deadheading: deadheading means pulling an empty trailer, and it too counts as regular driving time.3Federal Motor Carrier Safety Administration. Is a Motor Vehicle Owned by an Owner-Operator, and Being Dead-Headed (Returning Empty), or a Tractor That Is Being Bobtailed (Operating Without a Trailer), Subject to the Financial Responsibility Regulations?
How the Daily and Weekly Limits Treat Bobtail Time
Bobtail driving counts toward the 11-hour daily driving limit, which starts only after 10 consecutive hours off duty. It also runs against the 14-hour on-duty window that opens when you begin work for the day. Once that window closes, no more driving until another 10 consecutive off-duty hours are complete, no matter how few miles you actually drove.1eCFR. 49 CFR Part 395 – Hours of Service of Drivers – Section 395.3
The weekly caps work the same way. Drivers at carriers running every day of the week are limited to 70 hours across any 8 consecutive days. Drivers at carriers that don’t run daily are capped at 60 hours across 7 consecutive days. Either weekly cap resets after 34 or more consecutive hours off duty.4eCFR. 49 CFR 395.3 – Maximum Driving Time for Property-Carrying Vehicles
The 30-Minute Break
After 8 cumulative hours of driving without at least a 30-minute interruption, property-carrying drivers must take a break. It can be logged as off duty, on duty not driving, or sleeper berth. Bobtail hours count toward that 8-hour trigger.5Federal Motor Carrier Safety Administration. Summary of Hours of Service Regulations A common misread is treating a bobtail leg as a fresh start after dropping a trailer. It isn’t. The driving clock keeps running.
When a Bobtail Move Qualifies as Personal Conveyance
A tractor with no trailer can be used for personal conveyance if the driver has been completely relieved of all work responsibilities and the trip serves a purely personal purpose. Movement logged this way is off-duty time and does not count against any HOS limit.6Federal Motor Carrier Safety Administration. Personal Conveyance Runs to a restaurant, a grocery store, or a motel during a rest period are typical qualifying uses.
FMCSA sets no distance or time cap on personal conveyance. The federal prohibition on driving while fatigued still applies, so the driver must be adequately rested before moving the tractor at all.7Federal Motor Carrier Safety Administration. Personal Conveyance – Frequently Asked Questions The absence of a mileage cap isn’t a loophole. Inspectors judge the totality of the movement, and a lengthy “personal” trip to a restaurant invites scrutiny regardless of what the log says.
The Safe Haven Situation
A driver who runs out of available hours at a shipper’s or receiver’s facility may move the tractor to a nearby safe parking location as personal conveyance, but only if enough time remains to complete the required off-duty period before driving again. FMCSA’s guidance is explicit that personal conveyance cannot be used to stretch the duty period.7Federal Motor Carrier Safety Administration. Personal Conveyance – Frequently Asked Questions
Commuting Rules
Bobtailing home from a terminal after finishing a trip is not personal conveyance. FMCSA treats the return as a continuation of the dispatched trip and requires it to be logged as on-duty driving. Personal conveyance commuting is limited to travel between the driver’s home and an offsite work location, which the agency defines as somewhere other than the carrier’s terminal or a shipper’s or receiver’s facility, such as a temporary job site.7Federal Motor Carrier Safety Administration. Personal Conveyance – Frequently Asked Questions This is one of the most common places personal conveyance claims collapse during an audit.
Bobtail Moves That Must Stay on the Driving Clock
Any bobtail movement that advances the carrier’s commercial interests is driving time. FMCSA’s personal conveyance guidance names bobtailing to retrieve another load and repositioning a tractor at the carrier’s direction as examples that do not qualify.6Federal Motor Carrier Safety Administration. Personal Conveyance Other bobtail trips that must be recorded as on-duty driving include:
- Driving to a yard or customer to hook up to a load.
- Heading to a repair facility, since fleet maintenance serves the business.
- Moving toward a terminal or load after receiving dispatch.
- Any movement that gets closer to a delivery point or bypasses a weigh station along the commercial route.
Investigators look for patterns. Did the “personal” trip end near the next pickup? Did the driver go back on duty right after arriving at a nearby customer? Those are the questions that decide whether a log entry holds up.
Recording Bobtail Trips on the ELD
Before the tractor starts moving for a personal trip, the driver must switch the electronic logging device into Personal Use (PC) mode. That keeps the ELD from automatically flipping the movement to driving time once the vehicle passes five miles per hour.8Federal Register. Hours of Service of Drivers of Commercial Motor Vehicles Regulatory Guidance Concerning the Use of a Commercial Motor Vehicle for Personal Conveyance Add an annotation describing the purpose. Vague notes like “personal” draw follow-up questions; something specific such as “drove to Walmart for groceries” is much more useful during an inspection.
Motor carriers must retain electronic records of duty status and supporting documents for at least six months from receipt, with a backup copy stored on a separate device for the same period.9Federal Motor Carrier Safety Administration. How Long Must a Motor Carrier Retain Electronic Logging Device (ELD) Record of Duty Status (RODS) Data? Drivers must keep their own records for the previous seven consecutive days and have them available for inspection while on duty.10eCFR. 49 CFR 395.8 – Driver’s Record of Duty Status
Penalties for Getting It Wrong
Under the 2025 inflation-adjusted penalty schedule, recordkeeping violations, which cover incomplete, inaccurate, or falsified records of duty status, carry fines of up to $1,584 per day the violation continues, capped at $15,846 per case. Non-recordkeeping HOS violations by a driver can reach $4,812 per violation. The same violations charged against the motor carrier can hit $19,246. Carriers that require or permit a driver to operate during an out-of-service period face up to $23,647 per violation.11Federal Register. Revisions to Civil Penalty Amounts, 2025 These figures adjust for inflation every year, so the numbers move upward.
Disguising work-related bobtail moves as personal conveyance is the fastest way to end up on the wrong end of that recordkeeping cap. Log the tractor honestly: on the clock whenever the movement helps the carrier, off duty only when the trip is genuinely yours.