The HOS violations that most often raise CSA scores are driving beyond the 11-hour or 14-hour limits, missed 30-minute breaks, form-and-manner errors like missing or unsigned logs, unassigned or unidentified driving left unresolved, false or falsified logs, and misuse of personal conveyance or yard move. In CSA, violations are weighted by severity, so the serious ones move your score more.
Not every HOS violation is equal. FMCSA's Safety Measurement System weights each violation by severity, so a missing shipping document number and a falsified log do not carry the same weight. Here are the ones we see most across small fleets, roughly from routine to serious, and why each matters.
The most common HOS violations
- Driving beyond the limits. Driving past the 11-hour driving limit or the 14-hour window. These are core violations and generally carry real weight.
- Missed 30-minute break. Not taking the required break after 8 cumulative hours of driving.
- Form-and-manner errors. Missing shipping document numbers, missing trailer numbers, missing location details, unsigned or uncertified logs. Individually small, but they add up and signal sloppy recordkeeping.
- Unassigned or unidentified driving. Driving time the ELD recorded that nobody assigned to a driver. Left unresolved, it becomes a violation and a red flag.
- False or falsified logs. Logs that do not match the operation, or edits that follow a suspicious pattern. This is one of the most serious categories and draws the most scrutiny.
- Personal conveyance and yard move misuse. Using personal conveyance when it likely does not qualify, or yard move on public roads. A common way carriers accidentally create violations.
These reference the HOS rules in 49 CFR Part 395. Confirm what applies to your operation, since exceptions exist. Sources are at the end of this article.
How CSA weights HOS violations
In SMS, each violation is assigned a severity weight, and more recent violations are weighted more heavily than older ones. That means a single serious violation can move your HOS BASIC more than several minor ones, and a recent violation matters more than one that is aging off. The exact severity weightings are published by FMCSA, linked below. The practical takeaway: the falsification and over-hours categories are the ones to protect against hardest.
Why small fleets feel these more
A small fleet has fewer inspections to dilute a violation, so each one lands harder on the percentile than it would for a large carrier. One driver running messy logs can move your score in a way a 200-truck fleet would barely notice. That is not a reason to panic. It is a reason to catch issues daily.
How to catch them early
Almost every violation on this list is catchable before an inspection finds it, if someone reviews the logs daily. That is the whole point of a log audit: resolve unassigned driving, fix form-and-manner gaps, and spot the driver or dispatch pattern before it repeats. Our driver log auditing checklist walks through the daily and weekly review, and why HOS violations keep happening covers the dispatch habits behind them.
How Fleet Regulators helps
We audit every driver's logs daily, resolve unassigned driving, flag the serious categories fast, and document corrective action so it holds up in a DOT audit. We do not promise a specific CSA number. We help you stop feeding the BASIC that is hurting you. See real client results from fleets that did.
When I audit a new fleet, the form-and-manner stuff is annoying but survivable. What I really look for is the falsification pattern and the over-hours habit, because those are the ones that tell an inspector you have a culture problem, not a paperwork problem. Catch those early and the rest is cleanup.
Common Mistakes Carriers Make
(1) Treating form-and-manner errors as harmless because they seem small. (2) Leaving unassigned driving unresolved until it becomes a violation. (3) Letting personal conveyance and yard move drift into misuse. (4) Assuming all violations weigh the same. (5) Reviewing logs monthly instead of daily. (6) Fixing the driver but not the dispatch schedule that created the violation.
Catch Them Before the Inspector Does
Book a free compliance review. We will pull a sample of your recent ELD data and show you which HOS patterns are quietly raising your score.
Book a Free Compliance Review →HOS & Log Auditing
Fleet Regulators audits logs daily, resolves unassigned driving, coaches repeat offenders, and fixes the dispatch habits that create violations.
Get HOS Support →Frequently Asked Questions
Among the most frequent are driving beyond the allowable limits, form-and-manner errors such as missing information or unsigned logs, and unassigned driving time left unresolved.
Generally the more severe categories, such as driving over the limits and falsified logs, carry more weight than routine form-and-manner errors, because SMS weights violations by severity. More recent violations also weigh more than older ones.
FMCSA's SMS assigns each violation a severity weight and also weights violations by time, with more recent violations counting more heavily. The specific severity weightings are published by FMCSA in the SMS methodology.
It can help. A daily log audit catches most of these issues, unassigned driving, form-and-manner gaps, and repeat patterns, before an inspection does. It does not guarantee a lower CSA score, since your score also depends on inspection activity and violation history.