A new carrier put their first truck on the road last March. Driver was experienced, loads were solid, the operation felt like it was coming together. Six weeks later, they got hit with an out-of-service order at a roadside inspection. The violation was not a mechanical issue. It was an hours-of-service violation. The driver had exceeded the 14-hour on-duty window. Nobody in the operation had flagged it because nobody fully understood how the clock worked. That single incident cost them the load, a CSA score hit that would follow them for 24 months, and a week of scrambling to get back compliant.

This is not a rare story. Hours-of-service violations are among the most common findings at roadside inspections, and new operators are disproportionately exposed because FMCSA hours of service rules are more layered than they look on paper. The core limits sound simple: 11 hours of driving, 14-hour window, 30-minute break. But the way those rules interact, the moment each clock starts, and the way violations compound quietly across a week, that is where new operators consistently get caught.

This article explains the rules clearly, in plain language, with the specific details that matter for day-to-day operations. No regulatory legalese. Just the information a new operator needs to keep their drivers legal and their CSA score clean.

FMCSA hours of service rules for property-carrying drivers allow a maximum of 11 hours of driving within a 14-hour on-duty window, after 10 consecutive hours off duty. A 30-minute break is required after 8 cumulative hours of driving. Weekly limits are 60 hours in 7 days or 70 hours in 8 days, with a 34-hour restart available to reset the weekly total.

What Hours of Service Rules Actually Control

Hours of service regulations, governed by 49 CFR Part 395, set federal limits on how long a commercial motor vehicle driver can operate before they must rest. The rules apply to drivers of trucks and tractor-trailers in interstate commerce. They exist for one reason: driver fatigue is a documented factor in large-truck crashes, and the rules are designed to prevent carriers from pressuring drivers into working dangerously long shifts.

The FMCSA enforces these rules strictly. Violations show up in roadside inspection data and feed directly into your CSA score under the Hours-of-Service Compliance BASIC. The intervention threshold for that BASIC sits at the 65th percentile, which means FMCSA acts at a lower threshold here than for most other categories. A new carrier starts with no historical data, so every early violation carries outsized weight in the scoring model.

Additionally, the enforcement picture in 2026 is sharper than it used to be. Electronic Logging Devices are now mandatory for virtually all CMV operators, which means violations that once required a paper logbook audit to detect are now visible to enforcement officers in real time at the roadside. There is no more pencil-whipping a logbook. The ELD records what actually happened.

The Five Core FMCSA Hours of Service Rules, One by One

FMCSA hours of service rules for property-carrying vehicles in 2026 consist of five distinct limits that interact with each other. Understanding each rule individually is the first step. Understanding how they run simultaneously is what actually keeps drivers compliant.

Rule 1: The 11-Hour Driving Limit.

A driver may drive a maximum of 11 hours in a single shift, but only after having at least 10 consecutive hours off duty. This is the raw driving cap. Hours spent on duty without driving, at a shipper, fueling, waiting at a dock, do not count against this limit. But they do count against the next rule.

Rule 2: The 14-Hour On-Duty Window.

This is the rule that surprises most new operators. The 14-hour window begins the moment a driver starts any work, whether that is a pre-trip inspection, fueling, or loading. From that moment, all driving must be completed within 14 hours. The window does not pause. A driver who starts work at 7am must be done driving by 9pm, regardless of how much actual driving they did. Off-duty breaks during the day do not stop the 14-hour clock from running. That driver who started at 7am and spent two hours at a dock waiting is not gaining those two hours back. The clock kept moving.

Rule 3: The 30-Minute Break.

A driver who has been driving for 8 cumulative hours since the last break must take a minimum 30-minute break before continuing. The break can be spent off duty or on duty not driving. This rule resets once the break is taken, and the 8-hour count starts again from that point.

Rule 4: The 60/70-Hour Weekly Cap.

Drivers cannot exceed 60 hours on duty in any 7 consecutive days, or 70 hours in 8 consecutive days. Which cap applies depends on whether the carrier operates trucks every day of the week. If yes, the 70-hour cap applies. If the carrier does not operate on at least one day each week, the 60-hour cap applies. Consequently, this is a rolling limit, not a calendar week reset. Every day, the oldest day drops off and the most recent day adds on.

Rule 5: The 34-Hour Restart.

A driver can reset their weekly on-duty total by taking at least 34 consecutive hours off duty. This is called the restart provision. It allows drivers to begin a fresh 60 or 70-hour cycle without waiting for the rolling window to naturally clear. However, carriers should not treat the 34-hour restart as a routine scheduling tool. It should be used when operationally necessary, not as a workaround for pushing drivers to the edge of their weekly limit regularly.

The Sleeper Berth Option: How the Split Works

For long-haul drivers using a sleeper berth, the FMCSA allows the required 10-hour off-duty rest period to be split into two segments. In 2026, two configurations are permitted: a 7-hour segment in the sleeper berth plus a 3-hour segment either off duty or in the berth, or an 8-hour segment in the berth plus a 2-hour segment off duty or in the berth. The two segments can be taken in any order.

Neither segment counts against the 14-hour driving window, which is the practical advantage of the split. It gives long-haul drivers more flexibility to manage their rest around traffic, weather, and facility wait times. But the rule is more complex than the daily limits, and new operators running long-haul freight should take time to model out how a split actually looks across a full trip before assuming it works the way they think it does.

FMCSA Hours of Service Rules: Quick Reference Table

Here is every core rule in a single reference:

The Violations That Hit New Carriers Hardest

Not all HOS violations carry equal weight in the CSA scoring model. Some result in a driver being placed out of service on the spot. Others generate a citation that adds to the carrier’s violation history without immediately stopping the truck. New operators need to know which violations trigger the most serious consequences.

• Exceeding the 14-hour window: One of the most common violations at roadside inspections. If the ELD shows a driver driving after the 14-hour clock expired, the driver is immediately placed out of service. The load stops. The carrier scrambles.
• No ELD or ELD malfunction: As of 2026, three ELD devices (PSS ELD, Black Bear ELD, and RT ELD Plus) have had their registrations revoked. Carriers using revoked devices are operating out of compliance. The FMCSA maintains a registered ELD list at fmcsa.dot.gov and carriers should verify their device monthly.
• Missing 30-minute break: Drivers who have accumulated 8 hours of driving without a qualifying break and continue driving are in violation. The ELD records driving time continuously and the absence of the break is immediately visible to inspectors.
• Falsified or inaccurate logs: Pre-ELD, falsification meant editing a paper logbook. With ELDs, it typically means the driver’s manual edits to the log do not match the GPS and engine data. Inspectors compare those records. Discrepancies are treated as falsification, which carries significantly higher penalties than a standard HOS violation.

What Changes When You Scale Past One Truck

A single-truck operation can manage HOS compliance manually with reasonable effort. The owner knows the driver, knows the schedule, and can monitor hours directly. But at five trucks, and again at ten, the same personal awareness that worked before stops being reliable.

Furthermore, the operational risk scales faster than the fleet does. One HOS violation on one truck affects only that truck’s CSA score entry. But a carrier with a pattern of HOS violations across multiple trucks, even minor ones, accumulates a score that eventually triggers an FMCSA compliance review. For a new carrier still building their safety record, a review in the first two years is a serious operational disruption.

Therefore, growing carriers need to move from personal awareness of driver hours to systematic monitoring of hours across all active drivers. A TMS connected to ELD data that alerts dispatch when a driver is approaching the 14-hour window or within two hours of the weekly cap is not a luxury. It is the infrastructure that keeps compliance from becoming a reactive, post-violation problem.

The Rules Are Not Complicated. The Clock Is.

The individual FMCSA hours of service rules are not difficult to understand. Eleven hours of driving. Fourteen-hour window. Thirty-minute break after eight. Sixty or seventy hours per week with a 34-hour restart available. Each rule in isolation is clear enough that a new driver can learn it in an afternoon. The complication is that all five clocks run simultaneously, they interact with each other, and the ELD records everything. There is no longer any ambiguity about whether a violation occurred. The question is only whether the carrier found it first or the inspector did.

New operators who build compliance into their dispatch process from day one, rather than treating it as a separate safety department function, protect their CSA score when it is most vulnerable. The early months of a carrier’s operating history carry disproportionate weight. A clean record in year one is significantly easier to maintain than a damaged record in year one is to repair.

The clock starts the moment a driver begins work. That is true for the regulation and it is true for a new carrier’s compliance culture. Start it right.

Frequently Asked Questions