HOS Violations That Trigger the Highest CSA Penalties

If your HOS BASIC percentile is high, these are likely the violations driving it. Most HOS violations are manageable. These five are in a different category.

Here is what each one costs, why it happens, and what you can do about it.

How FMCSA weights HOS violations in the SMS

FMCSA's Safety Measurement System calculates BASIC percentiles using a severity weight assigned to each violation type. HOS violations have severity weights ranging from 1 to 10. The violations in this article carry weights of 7 to 10.

Severity weight is only part of the calculation. Time weighting multiplies the severity weight: violations from the past 6 months count at full value, violations from 7 to 12 months count at partial value, and violations older than 24 months drop out of the calculation entirely.

This means a cluster of recent high-weight violations does more damage to a BASIC percentile than many older low-weight violations. Carriers with one or two drivers racking up repeat high-weight violations can see BASIC percentiles move significantly within a few months.

BASIC percentile thresholds vary by violation type. For the HOS Compliance BASIC, carriers at or above 65 percent are subject to FMCSA intervention. Carriers above 80 percent are visible to brokers, shippers, and insurers who pull SMS data during carrier vetting.

Violation 1: Driving beyond the 11-hour limit

Regulation: 49 CFR 395.3(a)(3). Severity weight: 7.

A property-carrying driver who exceeds 11 hours of driving time following 10 consecutive hours off duty is in violation. The maximum civil penalty is up to $19,246. In practice, the assessed penalty for a single incident is typically lower, but repeat violations are treated more seriously.

This is the most common high-weight HOS violation in FMCSA enforcement data. ELDs make it easy for inspectors to identify: the driving time is right there in the log, time-stamped and geocoded.

Carriers with multiple 11-hour violations in a rolling 12-month period typically see HOS BASIC percentiles rise above 50. Carriers with multiple drivers generating repeat 11-hour violations are often in the intervention range within a quarter.

The root cause is almost always dispatch planning. Drivers are assigned more driving than they have available hours. Nobody checked. For more on how the 11-hour clock works, see our dedicated article: The 11-Hour Driving Limit Explained.

Violation 2: Driving beyond the 70-hour limit

Regulation: 49 CFR 395.3(b). Severity weight: 7.

The 70-hour on-duty limit caps how many total on-duty hours a driver can accumulate in any 8-consecutive-day period (or 60 hours in 7 days for carriers that do not operate every day of the week). A driver who exceeds 70 hours on duty in 8 days and continues driving is in violation.

This violation is typically caught by inspectors reviewing the 8-day log summary, which ELDs calculate automatically. It is less common than the 11-hour violation, but it is more indicative of a systemic scheduling failure. A driver who consistently runs at or near the 70-hour limit is operating in a way that does not allow adequate rest over the week.

Carriers that run dedicated routes with heavy weekly mileage requirements are most vulnerable to 70-hour violations. If drivers are consistently approaching the limit, the operation may need scheduling changes or additional drivers to share the workload. Running close to the limit is not inherently a violation, but it increases the risk of tipping into one.

Violation 3: False logs and log falsification

Regulation: 49 CFR 395.8. Severity weight: 10. The highest-weight HOS violation.

Falsifying a log is not just a civil violation. Under 49 USC 521(b)(2)(B), log falsification is a criminal offense. FMCSA defines falsification as any intentional misrepresentation of on-duty time, off-duty time, or driving time in the driver's record of duty status.

With ELDs, investigators have multiple data sources to cross-reference against the driver's log. A driver who logs 10 hours in the sleeper berth but whose ELD location data shows the truck moving 200 miles is falsifying. A driver whose log shows off-duty at a shipper but whose fuel purchase records place them 400 miles away is falsifying.

The tools available to FMCSA investigators for identifying false logs include:

• ELD movement and location data
• GPS device records
• Fuel purchase timestamps and locations
• Toll records
• Shipper and receiver delivery timestamps
• Cell phone tower data (in serious enforcement situations)

A single false log finding during a compliance review changes the entire tone of the audit. FMCSA does not treat log falsification as a paperwork problem. It is viewed as a trust problem. Once it appears in the record, everything else the carrier says during the review is evaluated through that lens.

Prevention: driver training on what falsification means and what the consequences are. GPS comparison audits that identify discrepancies between the log and actual location. Fuel receipt cross-reference reviews. A carrier that is periodically auditing its own ELD data against location history is far less likely to have false log violations.

Violation 4: Operating without a required ELD

Regulation: 49 CFR 395.22 and 395.8. Severity weight: 8.

Carriers subject to the ELD mandate that operate CMVs without a registered, properly functioning ELD are in violation at every roadside inspection. This is not a one-time finding. It accumulates with each inspection.

The most common causes:

• An ELD malfunction that was not replaced immediately. Carriers are required to have a malfunction protocol. Drivers can continue operating with a malfunctioning ELD for a limited period using paper logs, but extended operation without a functioning ELD is a violation.
• A carrier that simply has not complied with the mandate. This is less common now but still exists, particularly among carriers that have operated under exemptions and then lost eligibility.
• A newly added truck that was put in service before an ELD was installed.

Prevention: maintain a spare ELD inventory or a fast replacement protocol with your ELD vendor. When a device fails, replace it before the malfunction grace period expires. For newly added equipment, verify ELD installation before the first trip.

Violation 5: Driving while out of service

Regulation: 49 CFR 395.13. Severity weight: 10. Tied for the highest-possible citation in the HOS BASIC.

When a driver is placed out of service by a roadside inspector for an HOS violation, they are legally prohibited from operating the CMV until they have completed the required off-duty time. A driver who is OOS and continues to drive faces:

• Civil penalties up to $19,246 per violation
• Immediate jeopardy to the carrier's safety rating
• Potential criminal charges in serious situations

OOS driving violations are rare but catastrophic for BASIC scores. A single OOS driving violation, when combined with the original HOS violation that triggered the OOS order, can push a BASIC percentile into the investigation range in one event.

Prevention requires driver training that is explicit: when you are declared OOS, you do not drive until the required rest is complete. No exceptions for short distances. No exceptions because the load is late. No exceptions because the dispatcher says it is fine.

Dispatchers also need training. A dispatcher who pressures an OOS driver to continue moving is exposing the carrier to serious liability, both from the regulatory violation and from any accident that might occur while the driver is operating fatigued.

What carriers can do to prevent the highest-weight violations

The patterns behind these violations are predictable. Here is what actually works:

For 11-hour and 70-hour violations: train dispatchers to check remaining hours before assigning loads. Give them ELD portal access. Build a load assignment policy that requires a hours check before dispatch. Review ELD data weekly for approaching limits.

For false logs: periodic GPS and ELD data comparison audits. Driver training that covers what falsification is and what it costs. A culture where drivers know the rules and know that falsification gets caught.

For no-ELD violations: a spare device protocol, a replacement SLA with the ELD vendor, and a process for verifying ELD installation on new equipment before first trip.

For OOS driving: explicit driver training. Dispatcher training. A policy that says no dispatcher can authorize an OOS driver to move the truck.

The common thread across all five is that these violations do not require complex solutions. They require consistent process, training, and someone checking the data. Most carriers that come to us with elevated HOS BASIC percentiles have the ELD data. They just are not using it to catch problems before the inspector does.

For more on improving CSA scores and addressing HOS BASIC violations, see our service page. For DOT audit preparation, including how HOS violations affect your audit outcome, that is covered there as well.

The Safety Gal's Take

False log violations are the ones that end carriers. Not immediately. But false log findings during a compliance review are hard to overcome. FMCSA does not view them as a paperwork problem. They view them as a trust problem. And once a carrier has false log violations documented, everything else they say in the audit room is viewed through that lens.

Rhythm Gandhi

Founder, Fleet Regulators | The Safety Gal

Rhythm Gandhi is the founder of Fleet Regulators and is known publicly as The Safety Gal. She writes about practical DOT/FMCSA compliance, audit preparation, HOS, driver files, and fleet safety systems.