CDLTest360

Common Hours of Service Violations

The HOS violations that show up most on roadside inspections and how to avoid them.

Difficulty
Reading time
5 min
Applies to
All CMV drivers
Official source
FMCSA

According to FMCSA''s roadside inspection data, HOS violations are the most-cited category year after year. The pattern is the same at every level — the top five are consistent.

Top HOS violations

  1. Exceeding the 11-hour driving limit. Usually caused by miscounting yard-move or personal-conveyance time, or by trying to squeeze in "one more stop."
  2. Exceeding the 14-hour on-duty window. Once the 14-hour clock starts, off-duty breaks do not extend it (with narrow sleeper-berth exceptions).
  3. Missing the 30-minute break. You must take at least 30 consecutive minutes of non-driving time after 8 cumulative hours of driving.
  4. False log entries. ELDs catch this quickly — driving time recorded by the engine cannot be edited to off-duty.
  5. Not having or producing records of duty status. ELD malfunction without paper backup logs, or being unable to transfer data at inspection.

Consequences

Roadside out-of-service orders (you cannot drive until the required rest is complete), CSA points against you and your carrier, and civil penalties starting at hundreds of dollars per violation.

Key facts to remember about Common Hours of Service Violations

The material on this page is drawn from the FMCSA CDL Manual and, where a state rule differs, from the relevant state DMV manual. That is the same regulatory language your examiner will grade your written test against. When you sit for the CDL exam, questions on Common Hours of Service Violations are not usually trick questions — they test whether you have internalized the specific numbers, definitions, and procedures above and can apply them under time pressure.

Two habits separate drivers who pass this section on the first try from those who have to retake it. The first is treating the quick-answer box at the top of this guide as a fact you have to be able to write out from memory — not just recognize when you see it. The second is reading the common-mistakes list with the assumption that at least one of those wrong patterns is going to show up as a distractor on your exam. Both habits take five minutes per guide and dramatically reduce the number of questions you flag as "not sure" on test day.

How Common Hours of Service Violations fits the rest of your CDL study plan

This is one guide inside a Hours of Service topic pack on CDLTest360. The full topic covers every subject the FMCSA CDL Manual expects a commercial driver to know before taking the written exam. After you have worked through this page, the fastest way to lock in the material is to take a short practice test that draws from the same question pool your state DMV uses. Missed questions link back to the guide that answers them, so weak spots surface themselves — no guessing about what to re-read.

If any acronym or part name on this page is unfamiliar, every one of them is defined in the CDL glossary. Terms are auto-linked on first mention, so you can jump to a definition and come right back without losing your place. And if you are studying for a state-specific rule that is not identical to the federal regulation, always let your state CDL manual take precedence — this site is built on FMCSA material, and a handful of numbers (medical certification windows, permit-holding periods, endorsement fees) do vary by state.

Ready to test yourself?

Once you feel like you own this page, take a practice test on Hours of Service to prove it. Aim for a strong pass rate before moving on. If you are preparing for the full CDL exam, browse the rest of the CDLTest360 Learning Center — every topic in your state CDL manual has a matching guide, and each one is written the same way this page is: quick answer first, plain-English explanation second, real-world common mistakes third.

How to study this guide

A short, high-yield loop for locking in the material on this page before you sit the CDL exam:

  1. 1.Read the TL;DR quick answer at the top of this guide and re-write it in your own words. If you can't, read the body once and try again — that's the fact you're being tested on.
  2. 2.Walk through the common-mistakes section below. Every item on that list is a real reason drivers have failed this question in the past.
  3. 3.Take the linked practice test. Aim for 90% or better on the Hours of Service section before you move on.
  4. 4.The day before your official DMV test, re-read only the TL;DR box and the common-mistakes list on every guide you studied. That's your final review.

Why this matters for your CDL exam

Hours of Service is one of the sections the CDL written exam draws from directly. Examiners score against the exact language of the FMCSA CDL Manual, which is why every guide on CDLTest360 keeps the regulatory wording where it matters and only rewrites the surrounding explanation. If you understand common hours of service violations at the level of this page — the numbers, the definitions, and the reasons behind them — you'll recognize the correct answer even when the question is phrased differently than the practice tests you've seen.

One more thing worth knowing: the CDL written exam does not test memorization for its own sake. It tests whether you can apply these rules on the road, so anywhere in this guide you see a number, a step, or a component name, pair it in your head with when a driver would actually use it. That mental link is what turns a fact you read into an answer you can pick under time pressure on exam day.

Common mistakes
  • Trying to edit ELD driving time
  • Assuming off-duty breaks extend the 14-hour window
  • Ignoring the 30-minute break because "I feel fine"

Frequently asked questions

What happens if I'm placed out of service for an HOS violation?
You cannot drive until you complete the required rest period. Your carrier is notified and CSA points are assessed.
Can I edit driving time on my ELD?
You can add notes and correct duty status, but engine-recorded driving time cannot be changed to off-duty.

Test your knowledge

Put this guide into practice with a free CDLTest360 quiz.

Take the practice test More Hours of Service guides

Related guides

About this guide

This guide is part of the CDLTest360 Learning Center, a free set of study materials written for drivers preparing for the Commercial Driver's License (CDL) written exam in the United States. Every fact on this page comes from the current FMCSA CDL Manual or, where a state rule differs, the state DMV manual. Numbers, definitions, and procedures are quoted or paraphrased from those official sources; the surrounding explanation, the examples, and the common-mistakes list are original to CDLTest360.

The Learning Center is written by CDL instructors and reviewed against the federal regulations on a rolling basis. If you spot something that doesn't match what your local DMV taught you, state rules take precedence over anything on this site — always confirm the number with your state's CDL manual before your exam.

Last reviewed July 5, 2026 — reviewed against current FMCSA regulations.
Official source: FMCSA