Glossary

The period that opens when a driver comes on duty after the required rest. It runs on wall time rather than on driving, so time lost to loading or waiting comes out of it — a clock, not a budget.

A period of consecutive off-duty hours that may end a 7- or 8-day weekly period, restarting the weekly count.

An employer’s knowledge that a driver has used alcohol or controlled substances, based on the employer’s direct observation of the use, information from a previous employer, a traffic citation for driving under the influence, or the driver’s own admission. Observing behavior or physical characteristics is not actual knowledge — that is the separate trigger for reasonable suspicion testing.

Conditions a driver encounters that prevent safely completing a run within the normal limits. They add driving time rather than removing the limit, and the addition is capped.

A restriction placed on a license when the applicant takes the skills test in a vehicle without air brakes, or cannot demonstrate the air brake portion. The vehicle you test in decides what your license permits.

The measured figure the drug and alcohol program keys on. Two thresholds matter: 0.04 or greater is the prohibition, and 0.02 up to but not including 0.04 is a stand-down band. Neither is the standard that applies at the wheel, which is stricter — see Detected presence.

A note a driver or support personnel must attach to every change or addition made to an electronic record. An edit without one is not a correction the rule recognizes; a special driving category must be annotated when the device prompts.

The carrier’s duty to obtain each driver’s motor vehicle record from every State where the driver held a license, at least once every 12 months. Distinct from the annual review, which is what the carrier then does with it.

The carrier’s determination, at least once every 12 months, of whether a driver still meets the minimum requirements for safe driving — and whether they are disqualified.

The evidentiary standard for reasonable suspicion testing: specific, contemporaneous observations of a driver’s appearance, behavior, speech or body odors, made by a supervisor or company official trained for it, and recorded in writing.

A special driving category a carrier may configure an electronic logging device to offer. While it is selected, location is recorded only coarsely and engine hours and miles are left blank in intermediate recordings — the record distinguishing personal time from working time.

The driver record system a State posts information to about a licence holder — including a medical variance and its restriction code, and the medical certification status that decides whether the holder is shown as certified to drive in interstate commerce.

The federal database of drug and alcohol program violations. Employers must query it before hiring and at least once a year, the driver must consent before any query, and a violation stays visible until four conditions are met — including five years since the determination.

Pressure applied to a driver to operate in violation of the safety regulations. The prohibition reaches shippers, receivers and transportation intermediaries as well as the carrier, and the driver has a written complaint route.

The license required to operate a vehicle meeting the licensing definition. It is issued by the driver’s State of domicile, it may be held from only one State at a time, and the license rules reach intrastate driving even where the wider safety regulations do not.

The credential that allows a learner to drive a commercial motor vehicle on public roads while accompanied by a license holder. It is not a license; the minimum age for it is lower than the age at which a driver becomes qualified under the driver-qualification rules.

Two different definitions share this name and draw different lines, which is the single most consequential ambiguity in the subject. The safety-regulation definition begins at 10,001 pounds and adds passenger and hazardous-materials triggers; the licensing definition begins at 26,001 pounds and is built from the three vehicle groups. A vehicle can be fully inside the safety regulations and require no license. Always ask which definition is in play.

The standard that applies at the wheel: the driving rules prohibit any measured alcohol concentration or detected presence of alcohol while on duty or in physical control — no threshold at all — and place the driver out of service for 24 hours. Stricter than every figure in the testing program.

The condition under which a permit holder may drive: accompanied by a license holder who holds the proper class and endorsements, is seated beside them, and is at all times physically present in the vehicle.

The state in which a driver must not drive a commercial motor vehicle and an employer must not knowingly allow it. Periods are set by the offense, count convictions in a non-commercial vehicle for some categories, and are additional to any previous period rather than concurrent.

An operation in which the vehicle is moved by being driven or towed as the shipment itself rather than carrying a load. One of the situations in which a carrier may keep a driver on paper records rather than an electronic logging device.

Any person who operates any commercial motor vehicle. The term describes an act rather than a job, so it reaches an owner-operator, a casual or occasional driver and an independent contractor as surely as a full-time employee.

The file a carrier maintains for each driver it employs, holding the application, the inquiries and reviews, the road test or accepted equivalent, and the medical certification. Half of what goes in it is the driver’s to supply.

The form used to record the results of a ROADSIDE inspection by authorized federal personnel — a different document from the driver’s own inspection report, despite the near-identical name. It is what carries an out-of-service declaration.

The written report a driver prepares at the completion of each day’s work on each vehicle operated, listing any defect or deficiency that would affect safety of operation. No report is required where none was found — which is why the next driver may have nothing to review. Not to be confused with the Driver Vehicle Examination Report.

All time spent at the driving controls of a commercial motor vehicle in operation. Narrower than on-duty time, and the two together are why drivers with identical hours at work can have very different amounts of driving left.

The device that records duty status automatically and has been the default method since 2017. It captures eight data elements at events the driver does not choose, and the driver’s own input enters at duty status, annotations and the special driving categories.

Any individual, other than an employer, employed by an employer who directly affects commercial motor vehicle safety in the course of that employment. It expressly includes an independent contractor while operating, and its only exclusions are governmental.

A person engaged in a business affecting interstate commerce who owns or leases a commercial motor vehicle in connection with that business, or assigns employees to operate one. An employer who employs only themselves must comply with both the employer duties and the driver duties.

An authorization added to a license permitting a specific kind of operation. Three are tested by knowledge alone — double/triple trailers, tank vehicle and hazardous materials — and two add a skills test: passenger and school bus.

The training that must be completed before an applicant may take the skills test for a first license, an upgrade, or certain endorsements. It has theory and behind-the-wheel components and must be delivered by a provider on the federal registry.

A carrier exempt from economic regulation and expressly still subject to the safety regulations. Despite the name, being one is not an exemption from anything in this book.

What the driving rules require in hazardous conditions affecting visibility or traction. It requires reduced speed, and where conditions become sufficiently dangerous it requires operation to be discontinued rather than merely slowed.

A fraudulent or intentionally false statement or entry on, or fraudulent reproduction of, any application, certificate, report or record the regulations require. The prohibition binds the carrier and its people as squarely as the driver who signs.

A Clearinghouse query that releases a driver’s violation information to an employer and requires the driver’s specific consent. Required before employment and within 24 hours of a limited query that shows information exists.

The form a record of duty status is drawn on: a marked-out 24-hour timeline with a row for each duty status, on which a continuous line is drawn between the time markers for each period.

The narrow relief from the ill-or-fatigued prohibition: where stopping would increase the hazard to the vehicle’s occupants or other road users, the driver may continue — but only to the nearest place where that hazard is removed.

The rating for a combination of vehicles. Both weight definitions take the rating or the actual weight, whichever is greater, so loading past a rating does not keep a vehicle below a threshold.

The rating for a single vehicle, used the same way as the combination rating and with the same whichever-is-greater rule.

A defined term, narrower than the everyday word: a carrier’s use of information from an electronic logging device, or technology inseparable from it, that the carrier knew or should have known would result in a driver violating the ill-or-fatigued rule or the hours rules. Ordinary productivity monitoring is expressly preserved.

The endorsement required to transport placardable hazardous materials. Tested by knowledge, and the placard rather than the weight is what triggers the requirement.

The test that decides which rule governs at the wheel. A commercial motor vehicle is operated under the law of the jurisdiction it is in, except where a federal regulation asks more — in which case the federal rule must be complied with. The override runs upward only.

The body of rules limiting driving and on-duty time. The daily limits, the weekly limits and the exceptions are separate mechanisms, and an exception that removes the record does not remove the limit.

A basis on which a driver may be disqualified by the Administrator without any conviction — one of two disqualification routes that sit outside the offense tables entirely.

A record an electronic logging device makes on its own initiative while the vehicle is in motion and nothing else has been recorded in the previous hour. Part of the spine of entries a driver never makes.

A separate business from the carrier that tenders equipment to carriers rather than operating it. The inspection and maintenance rules run a parallel set of duties for it that this book does not otherwise cover.

Trade, traffic or transportation in one of three situations, the third of which decides most cases: a movement between two places in one State that is part of transportation originating or terminating outside it. The test attaches to the journey of the freight, not the route of the driver, and is answered per movement.

Defined only by exclusion — any trade, traffic or transportation in a State not described by the interstate term. There is no positive test for it, which is why the only question ever actually asked is the interstate one.

A Clearinghouse query that tells an employer only whether information about a driver exists, without releasing it. Permitted for the annual check, and it obliges a full query within 24 hours if information is there.

The most serious disqualifying convictions. A first conviction carries one year, three where the vehicle was carrying hazardous materials, and a second in a separate incident carries life. Two of them carry life on a first conviction with no reinstatement.

The certificate issued by an examiner listed on the National Registry, showing a driver is physically qualified. It is not the license and expires on its own clock, at a maximum gap the medical rules set.

An exemption or waiver from a physical qualification standard. It is the basis of a restriction placed on the license, and it is a federal instrument rather than a State one.

A for-hire or private carrier together with its agents, officers and representatives. For the purposes of the safety regulations the term includes employer and exempt motor carrier, so a duty written for a motor carrier reaches all three.

The register of medical examiners certified to perform the examination and issue the certificate. An examination by anyone not on it does not produce a valid certificate.

The self-certification category for a driver operating in interstate commerce and subject to the medical certification requirement — the category that makes the medical certificate a condition of the license status.

All time from when a driver begins work, or is required to be in readiness to work, until relieved from work and from all responsibility for performing work. It expressly includes waiting to be dispatched and time inspecting or servicing the vehicle.

The prohibition on holding more than one driver’s license at a time. It is shorter and stricter than drivers arriving from other trades expect, and it is enforced through the driver’s State of domicile.

An order prohibiting operation. It arises in several places — an alcohol violation at the wheel, a roadside declaration on a vehicle’s condition or loading — and where it attaches to a vehicle, operating includes towing it.

The annual inspection every commercial motor vehicle must have passed, with documentation on the vehicle. It counts each unit in a combination separately, so a current decal on the power unit proves nothing about what is behind it.

The medical half of being a qualified driver, established by examination and evidenced by the certificate. It is the qualification condition most likely to lapse, because it runs on its own clock.

The marking a vehicle must carry when transporting hazardous materials in a quantity that requires it. The placard rather than the weight is what brings a vehicle inside both the safety-regulation and licensing definitions.

The inspection a driver makes before driving, satisfying themselves the vehicle is in safe operating condition and reviewing the last inspection report where one was required. Also one of the three segments of the skills test.

A defined state with seven conditions, holding every day a driver drives — age, English ability, capability to operate the vehicle safely, physical qualification, a single valid license, not being disqualified, and having completed a road test or accepted equivalent. Being licensed is not the same as being qualified.

Prohibited more broadly than most drivers expect: no driver may use one, and none may operate a commercial motor vehicle that is equipped with or merely contains one. Possession in the vehicle is the offense.

The group from which drivers are selected for unannounced testing at minimum annual rates. An employer who employs only themselves must still be in a pool of two or more covered employees.

A testing trigger requiring specific, contemporaneous, articulable observations by a trained supervisor. Its consequences run even where no test is administered, keeping a driver off safety-sensitive functions until a test reads below the stand-down figure or 24 hours pass.

The record a driver keeps of duty status for each 24-hour period, in one of four statuses, submitted to the carrier and retained. Some short-haul drivers are exempt from keeping one at all — which is an exemption from the record, never from the driving limits.

A limitation placed on a license by what the applicant demonstrated or by a medical instrument. Most restrictions are earned by the vehicle taken to the skills test rather than imposed for cause.

The test a driver must pass before resuming safety-sensitive functions after a violation, following the evaluation and any prescribed education or treatment. Completing the process does not oblige an employer to return the driver to work, and does not restore a licensing privilege the State removed.

The condition a driver must be satisfied the vehicle is in before driving. The duty to maintain falls on the carrier; the prohibition on operating an unsafe vehicle falls on whoever drives it, so the first is never a defense to the second.

All time from when a driver begins work or is required to be in readiness to work until relieved from work and all responsibility for it — expressly including waiting to be dispatched, inspecting or servicing the vehicle, loading and unloading, and attending a disabled vehicle. Everything in the drug and alcohol program keys on it.

The driver’s statement of which category of operation they drive in, which determines whether the medical certificate is required and how it reaches the licensing record.

A category of conviction that disqualifies only on a second conviction in a separate incident within a three-year period. The first conviction starts a clock rather than a penalty, which is what makes this the table that catches careful drivers.

Two provisions relieving a qualifying driver of the record of duty status, with the carrier keeping time records instead. One touches the record only; the other also displaces a daily driving limit and substitutes its own.

A berth conforming to the equipment requirements, in which off-duty time may be taken. It also allows the required rest to be split, under conditions the sleeper-berth rules set.

The arrangement allowing the required off-duty period to be taken in two qualifying parts. The pairing recalculates the window rather than merely pausing it, which is the part drivers most often get wrong.

The State in which a driver has their true, fixed and permanent home, and the only State that may issue their license. It decides where you apply, where you test, and where notifications go.

The body of federal motor carrier safety regulations this book covers. State safety law is preserved alongside it, and being excepted from it does not except a driver from the license rules or the drug and alcohol program.

The professional who evaluates a driver after a violation and prescribes education or treatment. The return-to-duty test cannot occur until the professional determines the driver has successfully complied.

The paper trail that lets on-duty not driving time be checked against something other than the driver’s word — bills of lading, dispatch and trip records, expense receipts, fleet-management communications and payroll documents. The driver submits them on the same clock as the log.

A section of the regulations that is fully written, fully readable, and not in force — its replacement carrying a suffixed number. Two of the sections this subject rests on are in that state, and nothing in the body of the text announces it.

Part of what the texting and hand-held phone prohibitions count as driving: stops for traffic, a traffic control device or other momentary delays. Driving stops only once the vehicle is off the highway and safely halted.

The account an electronic logging device assigns to driving that happens with nobody logged in. A driver prompted with unassigned time must either assume the records or indicate they are not theirs — doing neither is not an option.

The three classes the licensing rules sort vehicles into — combination, heavy straight and small — which decide what a driver is tested on and what the license permits. The group ladder allows a license for one group to reach another under stated conditions.

A special driving category a carrier may configure a device to offer, selected before the status begins and deselected when it ends. Left running past the gate, it misstates a record the driver has certified as correct.