A
ACI eManifest
ACI eManifest is the CBSA Advance Commercial Information requirement that highway carriers transmit cargo and conveyance data electronically at least one hour before arriving at the Canadian border.
Before a commercial truck reaches a Canadian port of entry, the carrier files two things electronically: the conveyance data, which is the truck, trailer and driver, and the cargo data, which is each shipment on board. The filing goes through the CBSA eManifest portal or an EDI service provider. The driver presents a lead sheet with the conveyance reference number at the booth. Filing late or with mismatched data can mean a monetary penalty under the Administrative Monetary Penalty System and a hold at the border. Empty trucks also need a conveyance report. The US equivalent for southbound loads is the CBP ACE manifest.
Apportioned plates
Apportioned plates are the licence plates issued under IRP that allow a commercial vehicle to operate in every jurisdiction listed on its cab card.
An apportioned plate shows the base jurisdiction and the word "apportioned" or "APP". The cab card that goes with it lists the jurisdictions and the registered weight in each, and enforcement checks the card, not the plate. Adding a jurisdiction mid-year means a supplemental application and a fee. Running in a jurisdiction not on the cab card requires a trip permit. Plates renew annually, and many jurisdictions stagger renewal months by carrier. Fees depend on the registered weight and on the mileage share, so a truck that runs mostly in one state pays most of its fee there.
B
Base jurisdiction (IFTA and IRP)
The base jurisdiction is the state or province where a carrier holds its IFTA licence and IRP registration, files its returns and keeps its records.
To base in a jurisdiction, the carrier needs an established place of business there, qualified vehicles registered there, and operational records kept or made available there. The base jurisdiction issues the IFTA licence and decals and the IRP apportioned plates, receives the returns, collects the tax and fees, and audits the carrier on behalf of every other member. A carrier normally has the same base for IFTA and IRP. A Quebec carrier is based in Quebec through Revenu Québec for IFTA and the SAAQ for IRP, and files its US miles there rather than in any US state.
Base state (UCR)
The base state is the state where a carrier registers and pays its UCR fee, normally its principal place of business or, for a foreign carrier, a designated participating state.
A US carrier registers for UCR in the state of its principal place of business if that state participates. If the home state does not participate, such as Oregon or a few others, the carrier picks the nearest participating state by rule. Canadian and Mexican carriers register in the participating state where they run the most miles or, failing that, one they choose. The base state collects the fee and distributes it among participating states. UCR base state is a different concept from the base jurisdiction used for IFTA and IRP, although for most carriers it ends up being the same state.
BASICs
The BASICs are the seven Behavior Analysis and Safety Improvement Categories that CSA uses to group violations: unsafe driving, crash indicator, hours-of-service, vehicle maintenance, controlled substances and alcohol, hazardous materials and driver fitness.
Each roadside violation maps to one BASIC. Unsafe Driving covers speeding, seat belts and lane changes. Crash Indicator uses DOT-reportable crashes. Hours-of-Service Compliance includes logbook and ELD violations. Vehicle Maintenance is the largest by volume: brakes, lights and tires. Controlled Substances and Alcohol covers positive tests and possession. Hazardous Materials applies to placarded loads. Driver Fitness covers licences, medical certificates and English proficiency. Percentiles in each category drive FMCSA interventions and the Inspection Selection System score that decides who gets pulled in at scales. A single owner-operator can see a bad percentile from one inspection.
Biennial update
The biennial update is the MCS-150 filing every carrier must make at least every two years, even if nothing changed, by a month set by the digits of the USDOT number.
The due month is the last digit of the USDOT number: 1 is January through 9 is September and 0 is October. The year is even if the second-to-last digit is even and odd if it is odd. A carrier with USDOT number 1234567 files in July of odd years. The filing is free in Motus. Missing it leads to deactivation of the USDOT number, which stops the carrier at roadside, and civil penalties up to 1,000 USD per day capped at 10,000 USD, adjusted for inflation. New carriers are on the schedule immediately, so the first update can come within months of registration.
BOC-3
A BOC-3 is the designation of process agents filing that FMCSA requires before granting operating authority, naming someone in each state who can accept legal papers for the carrier.
Form BOC-3 designates a process agent in every state where the carrier operates or, in practice, a blanket agent covering all states. It is filed electronically by the process agent company, not by the carrier, and there is no government fee. Carriers, brokers and freight forwarders must have one on file before authority is granted, and it must be kept current. A private carrier that only needs a USDOT number does not file a BOC-3. If the carrier is sued in another state, papers served on the process agent count as served on the carrier.
C
C/TPA (consortium / third-party administrator)
A C/TPA is a service agent that manages a DOT drug and alcohol testing program, including the random pool, for one or more motor carriers.
A consortium / third-party administrator runs the parts of a DOT testing program a carrier cannot practically run alone: random selections, scheduling, collection-site coordination, laboratory and MRO communication and record keeping. Owner-operators must use a C/TPA because a pool of one cannot make random selections. FMCSA also lets carriers designate a C/TPA in the Drug and Alcohol Clearinghouse to run queries and report violations on their behalf. A C/TPA is not a government body and cannot be "DOT-approved"; it operates under the rules in 49 CFR Part 40 and Part 382. Profirm has been a C/TPA since 1988.
Cabotage
Cabotage is the transportation of domestic freight between two points in the same country by a foreign carrier, which is prohibited for Canadian and Mexican trucks in the US except in narrow cases.
A Canadian carrier may bring a load from Montreal to Chicago and pick up a load in Chicago for Canada. It may not haul freight from Chicago to Dallas. US customs rules allow a foreign truck to move point-to-point in the US only incidentally to the international movement, such as repositioning empty or, under specific conditions, carrying a domestic load on the way to the export pickup. The driver's immigration status also matters: a Canadian driver admitted as a business visitor cannot perform domestic work. Violations lead to penalties, seizure of the vehicle and a ban on the driver.
Carrier code (CBSA)
A CBSA carrier code is the four-character identifier the Canada Border Services Agency assigns to a carrier that transports commercial goods into Canada.
Any carrier bringing commercial freight into Canada, whether Canadian or US-based, needs a carrier code before its first crossing. The code appears on the cargo control document and in the ACI eManifest. Bonded carriers can move goods in bond past the border to an inland warehouse; non-bonded carriers must release at the first port. Applying is free through the CBSA portal and takes a few weeks, so US carriers accepting their first northbound load should not leave it to the last day. A carrier code is separate from the FMCSA USDOT number and from the Canadian provincial safety codes such as Quebec's NIR and Ontario's CVOR.
CDL (commercial driver's license)
A commercial driver's license is the state-issued licence required to operate vehicles over 26,000 lb GVWR, vehicles carrying 16 or more passengers, or placarded hazardous materials.
The CDL comes in classes A, B and C with endorsements for tankers, doubles and triples, hazardous materials and passengers. Applicants complete entry-level driver training from a registered provider, hold a commercial learner's permit for at least 14 days and pass knowledge and skills tests. A CDL holder is subject to Part 382 drug and alcohol testing and to the Clearinghouse. Convictions in any vehicle can disqualify the CDL. Canadian provincial commercial licences are recognized in the US under reciprocity, so a Quebec class 1 driver crosses the border on the provincial licence.
Clearinghouse (FMCSA Drug and Alcohol Clearinghouse)
The Clearinghouse is FMCSA's online database of CDL drivers' drug and alcohol program violations, which employers must query before hiring and at least once a year.
Since January 2020, employers, MROs, SAPs and C/TPAs report violations and return-to-duty steps to the Clearinghouse, and employers must check it before a driver starts and annually thereafter. Drivers register to give consent and to see their own record. Owner-operators must designate a C/TPA in the system. Query plans cost 1.25 USD per query and are bought by the employer. Since the Clearinghouse-II rule, a driver in prohibited status also loses their CDL privileges through the state licensing agency. As of January 2026 about 328,000 drivers had at least one violation and about 202,000 were in prohibited status.
Clearinghouse-II
Clearinghouse-II is the FMCSA rule, effective November 18, 2024, that requires state licensing agencies to downgrade the CDL of any driver in prohibited status.
The first Clearinghouse rule created the database. The second rule closed the gap between the database and the licence in the driver's pocket. States now query the Clearinghouse before issuing, renewing, transferring or upgrading a CDL, and must remove the commercial privilege of any driver in prohibited status within 60 days. The driver keeps a non-commercial licence. Once the driver completes return-to-duty, the state reinstates the privilege after the driver applies. In practice, a positive test now ends a driver's ability to work within two months unless the return-to-duty process starts immediately.
CSA (Compliance, Safety, Accountability)
CSA is FMCSA's enforcement program that scores carriers on roadside inspection and crash data so that interventions target the highest-risk operations.
CSA collects every roadside inspection, violation and reportable crash for a USDOT number over 24 months, weights them by severity and time, and ranks carriers against peers of similar size in seven categories called BASICs. Carriers over a threshold in a category receive warning letters, targeted investigations or full compliance reviews. Since 2016 most percentiles are hidden from the public, but carriers see their own data in the Safety Measurement System, and brokers and insurers still obtain scores through third-party services. Accurate vehicle and mileage counts on the MCS-150 matter because they set the peer group.
CVOR (Commercial Vehicle Operator's Registration)
A CVOR certificate is Ontario's registration for operators of commercial vehicles over 4,500 kg, which tracks the carrier's safety record and must be carried in the truck.
Ontario issues the CVOR to the operator responsible for a commercial vehicle, whether the operator owns or leases it. The certificate has a safety rating based on collisions, convictions and inspection results over 24 months, and Ontario can require an audit, add conditions or cancel the certificate when the rating deteriorates. A copy must be in every truck. Carriers based outside Ontario, including US carriers, need a CVOR if they operate in Ontario, unless they are plated in a jurisdiction Ontario exempts. The CVOR number is often requested on Ontario bills of lading alongside the USDOT number.
D
DataQ
DataQs is FMCSA's online system for requesting a review of inspection, violation or crash data that a carrier or driver believes is wrong.
Roadside data is entered by thousands of officers and errors happen: a violation cited to the wrong carrier, a crash that was not DOT-reportable, a charge dismissed in court. A DataQ request goes to the state that recorded the event, which reviews it and can amend or remove it. Successful requests improve CSA percentiles and the Pre-Employment Screening Program record used by hiring carriers. Requests should include the inspection report, court documents or photos, and a short factual statement. Since 2023 a national appeal process exists for certain denied requests. Filing is free and does not require a lawyer.
DER (Designated Employer Representative)
The Designated Employer Representative is the person at the motor carrier authorized to receive test results and remove drivers from safety-sensitive duty.
Every employer under 49 CFR Part 40 must name a DER. The DER receives communications from the MRO, the C/TPA, the collection site and the breath alcohol technician, and has the authority to take a driver off the road immediately after a positive result or a refusal. A service agent such as a C/TPA cannot be the DER; the role must sit inside the carrier. In a one-truck company the owner-operator is usually the DER for administrative purposes, which is one reason FMCSA requires owner-operators to use a C/TPA for random selections. The DER should be listed in the written drug and alcohol policy.
DQ file (driver qualification file)
A driver qualification file is the set of records a motor carrier must keep for each driver to show they are qualified to operate a commercial motor vehicle under Part 391.
The DQ file contains the employment application, the motor vehicle record obtained at hiring and each year after, the annual review of the driving record, the medical examiner's certificate and, for CDL drivers, verification that the medical status is on the CDLIS record, the road test certificate or its equivalent, and the previous-employer safety performance history inquiries. Records must be kept for the length of employment plus three years. The file is one of the first things a new-entrant auditor asks for and missing files are an automatic failure. Owner-operators must keep a DQ file on themselves.
E
ELD (electronic logging device)
An ELD is a device connected to the truck's engine that automatically records driving time and produces the hours-of-service log that most CMV drivers must keep.
Since December 2017 most drivers required to keep records of duty status must use an ELD registered with FMCSA instead of paper logs. Exceptions include drivers who keep logs on eight or fewer days in a 30-day period, driveaway-towaway operations and vehicles with engines older than model year 2000. The device records engine hours, miles and location and lets the driver annotate duty status. At roadside the driver transfers the log electronically to the inspector. Canada has its own ELD mandate with third-party certification, so cross-border carriers need a device certified in both countries.
English language proficiency
English language proficiency is the driver qualification requirement to read and speak English well enough to converse with the public, understand traffic signs, respond to officials and complete records.
The requirement has been in the driver qualification rules for decades, but since June 25, 2025, an inspector who finds a driver unable to meet it places the driver out of service. Inspections start with a conversation in English; if the driver cannot respond, the inspector administers a signs test. Interpreters, translation apps and cue cards are not allowed during the assessment. FMCSA published a proposed rule on August 10, 2026 to formalize the standard. Canadian drivers, including French-speaking Quebec drivers, are held to the same requirement when they operate in the US.
F
Follow-up testing
Follow-up testing is a series of at least six unannounced, directly observed DOT tests in the first 12 months after a driver returns to duty, continuing for up to five years.
The Substance Abuse Professional sets the follow-up plan. The minimum is six tests in the first year, but the SAP can require more and can extend the plan up to 60 months. Follow-up tests are in addition to random tests, are always directly observed and cannot be substituted with random selections. The employer, or the C/TPA for an owner-operator, must schedule them and keep the SAP plan on file. A new employer inherits the remaining follow-up plan, which appears in the driver's Clearinghouse record when a full query is run.
Fuel permit
A fuel permit is a temporary IFTA substitute that lets a qualified motor vehicle without IFTA decals enter a state or province for a short period and settles the fuel tax for that trip.
A carrier that has not yet received its IFTA licence, or whose licence is in another name, buys a fuel permit from each jurisdiction it will cross. Permits usually cover 72 hours to 30 days and cost between about 15 and 50 USD, often with a wire or service fee on top. The permit must be in the cab before entering the jurisdiction; buying one after a stop at the scale is too late. A new carrier making its first runs while the IFTA application is pending is the typical user. Two or three fuel permits usually cost more than the IFTA setup, so filing IFTA early is cheaper.
Full query
A full query is the pre-employment Clearinghouse check that shows a prospective driver's complete violation and return-to-duty record with the driver's electronic consent.
Before a driver performs any safety-sensitive function for a new employer, the employer must run a full query and receive a result showing no prohibition. The driver consents electronically in their own Clearinghouse account within 24 hours or the query lapses. A full query also replaces the old three-year previous-employer drug and alcohol history check for violations after January 2020. A C/TPA designated by the employer can run the query. Full queries are also required to resolve a limited query that returns information. The government fee is the same 1.25 USD per query.
G
GVWR (gross vehicle weight rating)
GVWR is the maximum loaded weight of a vehicle set by its manufacturer, and it decides which federal safety rules and which fuel and weight taxes apply.
The GVWR is printed on the door-jamb label. A vehicle or combination with a GVWR or actual weight over 10,000 lb is a commercial motor vehicle under the safety regulations, which triggers the USDOT number, DQ files, medical certificates and hours-of-service. Over 26,000 lb it also triggers CDL requirements, IFTA and IRP, and the drug and alcohol testing program. Weight-distance taxes use registered or declared weight thresholds that differ by state. Because rules key off rating rather than actual load, a pickup and trailer combination rated over 10,000 lb is regulated even when it runs empty.
I
IFTA (International Fuel Tax Agreement)
IFTA is the agreement among the 48 contiguous US states and 10 Canadian provinces that lets a carrier report and pay fuel tax to all of them through one quarterly return in its base jurisdiction.
Before IFTA a carrier needed a fuel permit in every state it crossed. Now the base jurisdiction issues one licence and one set of decals per truck, and the carrier files one return each quarter listing miles and fuel purchased in every jurisdiction. Tax is redistributed by the jurisdictions. Returns are due April 30, July 31, October 31 and January 31. The late penalty is 50 USD or 10 percent of the tax, whichever is greater, plus interest, and two delinquent quarters can lead to licence revocation. Quebec and Ontario are members, so a Quebec carrier files its US miles on the Quebec return.
IRP (International Registration Plan)
IRP is the agreement that lets a carrier register a commercial vehicle once in its base jurisdiction and pay registration fees apportioned to every state and province it travels in.
IRP handles licence plates the way IFTA handles fuel tax. The carrier reports the miles run in each jurisdiction, and the base jurisdiction collects a fee split among them according to the mileage percentages. The vehicle receives one apportioned plate and a cab card listing every jurisdiction it may enter. First-year registrations use estimated miles from a chart because there is no history. Vehicles over 26,000 lb, with three or more axles, or in combinations over 26,000 lb need IRP when they cross state lines. Quebec and Ontario are members; a Quebec carrier gets its apportioned plate from the SAAQ.
L
Limited query
A limited query is the annual Clearinghouse check that tells an employer whether a current driver has any record, without showing the details.
Every employer must run a limited query on each CDL driver it employs at least once every 12 months. The driver signs a general consent form kept by the employer, not in the Clearinghouse, and it can cover several years. The result is yes or no. If information exists, the employer has 24 hours to obtain the driver's electronic consent and run a full query, and the driver may not perform safety-sensitive functions until that full query comes back clear. Missing annual queries is one of the most frequent findings in compliance reviews since 2021.
Login.gov
Login.gov is the US government sign-in service that Motus uses to verify the identity of the company official before any FMCSA registration filing.
To create or update an FMCSA registration, the company official signs in to Motus with a Login.gov account that has completed identity verification. Verification uses a government photo ID and a facial match through IDEMIA, and it takes a few minutes with a phone camera. The official must be an owner or employee; a consultant cannot verify on the company's behalf. Once verified, the official can authorize third-party filers inside Motus. Canadian and Mexican officials can verify with a passport. Losing access to the Login.gov account means losing access to the registration, so record the recovery codes.
M
MC number
An MC number is the docket number FMCSA issued with operating authority until October 1, 2025; existing MC numbers remain valid but new ones are no longer issued.
For decades brokers and shippers asked for a carrier's "MC number" as shorthand for operating authority. FMCSA stopped issuing MC, FF and MX docket numbers on October 1, 2025 and now identifies authority with suffixes on the USDOT number. Carriers granted authority before that date keep their MC number and can still print it on their trucks and paperwork. Load boards and factoring companies have updated to accept the USDOT number with suffix. When someone asks a new carrier for an MC number, the answer is the USDOT number and the authority type.
MCS-150
The MCS-150 is the Motor Carrier Identification Report, the form used to apply for a USDOT number and to update the carrier's information every two years.
The MCS-150 records the carrier's legal name, addresses, operation type, cargo, number of vehicles and drivers, and mileage. It is filed in Motus when the USDOT number is first issued, whenever the information changes and at least every 24 months in the biennial update. Vehicle and driver counts on the form feed CSA scores and the UCR bracket, so they should be accurate. There is no government fee to file. Variants exist for hazardous materials (MCS-150B) and intermodal equipment providers (MCS-150C). A carrier that stops operating files the form to deactivate the number rather than leaving it stale.
Form MCS-90
Form MCS-90 is the endorsement attached to a for-hire carrier's liability insurance policy that guarantees payment to the public for judgments up to the federal minimum, even if the policy would otherwise not cover the loss.
FMCSA requires most for-hire carriers to maintain public liability insurance of at least 750,000 USD for general freight, 1,000,000 USD for oil, and 5,000,000 USD for certain hazardous materials. The insurer files proof electronically and attaches the MCS-90 endorsement to the policy. The endorsement makes the insurer pay a member of the public injured by the carrier's negligence up to the federal minimum regardless of policy exclusions, then lets the insurer recover from the carrier. It must be kept at the principal place of business. Cancelling the policy requires 30 days notice to FMCSA, which then revokes authority if no replacement is filed.
Medical certificate
A medical certificate is the card issued by a certified medical examiner showing that a driver meets the physical qualification standards to operate a commercial motor vehicle.
Drivers of vehicles over 10,000 lb GVWR in interstate commerce must pass a DOT physical from an examiner listed on the FMCSA National Registry. The certificate is valid for up to 24 months, shorter for drivers with conditions such as high blood pressure or those needing an exemption. CDL drivers no longer carry the card once the examiner transmits the result electronically to the state, which posts it on the CDLIS record, but non-CDL drivers still carry it and the carrier keeps a copy in the DQ file. Canadian drivers use a Canadian medical under reciprocity. An expired medical makes the driver unqualified immediately.
Motus
Motus is FMCSA's registration system, launched May 14, 2026, that replaced the FMCSA Portal and the Unified Registration System for USDOT numbers, authority and updates.
Motus is where a carrier applies for a USDOT number, requests operating authority, files the MCS-150 biennial update, adds or removes authority types and manages who can act for the company. The company official, who must be an owner or employee and not an outside consultant, verifies identity through Login.gov with a government ID and a facial match. The official can then authorize a third-party filer such as Profirm inside Motus. The only real address is motus.dot.gov; FMCSA flagged four copycat sites in September 2026. FMCSA never charges for Motus forms and never robocalls carriers.
MRO (Medical Review Officer)
A Medical Review Officer is a licensed physician who reviews laboratory drug test results and decides whether a positive result has a legitimate medical explanation.
Every DOT drug test result passes through an MRO before it reaches the employer. The MRO receives the laboratory result, contacts the driver when the lab reports a positive, adulterated, substituted or invalid specimen, and gives the driver a chance to explain, for example with a valid prescription. Only after that review does the MRO report a verified result. The MRO also handles split-specimen requests and reports verified positives and refusals to the Clearinghouse. An MRO must hold specific training and certification and must be independent of the laboratory.
MVR (motor vehicle record)
A motor vehicle record is the driving history report from a state licensing agency that a carrier must obtain for each driver at hiring and at least once every 12 months.
The MVR shows the licence status, endorsements, convictions and suspensions on file with the state. The carrier requests it from every state where the driver held a licence in the previous three years, within 30 days of hiring, and reviews a fresh one every year as part of the annual review of the driving record. The record goes in the DQ file. A Canadian driver's equivalent is the provincial driver abstract, which US carriers and auditors accept. Pulling MVRs is cheap; not pulling them is a common audit finding and, after a crash, a discovery problem for the carrier's insurer.
N
New York HUT (Highway Use Tax)
New York HUT is a weight-distance tax on motor vehicles over 18,000 lb operating on New York public highways, requiring a certificate of registration and decal per vehicle and quarterly returns.
The tax is calculated on miles traveled in New York, excluding the Thruway toll portion, at rates set by gross weight or unloaded weight. Each vehicle needs a certificate of registration and a decal, currently 1.50 USD per vehicle, before entering the state. Returns are filed quarterly through the state's Online Services, even when no miles were run. Vehicles that only enter New York occasionally can buy a trip certificate instead. HUT is separate from IFTA fuel tax and from IRP registration. Canadian carriers crossing at Champlain, Lacolle or the Peace Bridge in Buffalo fall under HUT as soon as they enter New York.
New-entrant safety audit
The new-entrant safety audit is FMCSA's review of a new carrier's records within the first 12 months of operation to confirm basic safety management controls are in place.
Every new USDOT registrant enters an 18-month new-entrant period and receives a safety audit, usually in the first year and often done remotely. The auditor asks for the drug and alcohol program, consortium membership, pre-employment results, driver qualification files, hours-of-service records, vehicle inspection and maintenance files and insurance. The audit is pass or fail. Automatic failures include no random testing program, using a driver with a positive test, no insurance, no DQ files and false records. A failed audit gives the carrier 60 days to submit a corrective action plan or lose its registration.
NIR (Quebec heavy vehicle operator registration)
The NIR, numéro d'identification au Registre, is the number the Commission des transports du Québec assigns to every heavy vehicle owner or operator registered in Quebec's heavy vehicle registry.
Quebec requires anyone who owns or operates a heavy vehicle, meaning over 4,500 kg gross weight or a bus, to register with the Commission des transports du Québec and to obtain a NIR before operating. The registry tracks the operator's safety record, and the Commission can impose conditions or bar an operator with a poor record. The NIR must appear on the vehicle registration and be available to inspectors. US carriers operating regularly in Quebec also register. The NIR is separate from the USDOT number that the same carrier needs for its US operations and from the CBSA carrier code.
Non-domiciled CDL
A non-domiciled CDL is a commercial licence a US state issues to a driver whose home is outside that state or outside the country, now limited by a 2026 rule to certain visa holders.
States issue non-domiciled CDLs and commercial learner's permits to people domiciled elsewhere who are legally present in the US. FMCSA's final rule of February 13, 2026, effective March 16, 2026, restricted eligibility to specific employment-based visa categories with verified status and shortened licence validity. Drivers from Canada and Mexico are not affected because their provincial or federal licences are recognized under reciprocity and they do not need a US licence. Carriers employing non-domiciled CDL holders should check the licence expiry against the visa and keep the immigration documents the state relied on in the DQ file.
O
Operating authority
Operating authority is FMCSA's permission for a for-hire carrier, broker or freight forwarder to transport regulated commodities or arrange transportation in interstate commerce.
A USDOT number identifies you; operating authority lets you charge for hauling other people's freight across state lines. Private carriers hauling their own goods and carriers of exempt commodities such as unprocessed agricultural products do not need it. Each authority type carries a 300 USD government fee paid on Pay.gov. FMCSA grants the authority after the application, proof of insurance from the insurer and a BOC-3 filing, usually about 21 days after filing, and there is a protest period. Since October 2025 authority types are shown as suffixes on the USDOT number rather than separate MC numbers.
Oregon weight-mile tax
The Oregon weight-mile tax is charged on vehicles with a combined weight of 26,000 lb or more for every mile traveled on Oregon public roads, reported monthly, and Oregon does not collect fuel tax from these vehicles under IFTA.
Oregon is unusual in two ways. It taxes heavy vehicles by weight and mile rather than by fuel, so on an IFTA return Oregon miles show a zero fuel tax rate. And it requires new carriers to post a bond or deposit before issuing a weight receipt, unless they buy temporary passes. Rates rise with declared weight and, above 80,000 lb, with the number of axles. Returns are monthly for most carriers, quarterly for those with a good filing history who apply. Enforcement is strict at the ports of entry, and running without a valid weight receipt or temporary pass results in a citation and a hold.
Out-of-service order
An out-of-service order is a declaration by an inspector that a driver, vehicle or carrier may not operate until a specified violation is corrected.
Out-of-service criteria are set by the Commercial Vehicle Safety Alliance and adopted by FMCSA and the states. A driver is placed out of service for hours-of-service violations, no valid licence or medical certificate, English proficiency, alcohol or drug use and prohibited Clearinghouse status. A vehicle is placed out of service for defects such as brake, tire or steering problems above a threshold. A carrier receives an out-of-service order for an Unsatisfactory rating, unpaid penalties or an imminent hazard. Operating in violation of an order carries civil penalties and, for the driver, CDL disqualification. Rates feed the CSA data and inspection selection.
P
PARS (Pre-Arrival Review System)
PARS is the CBSA process that lets a customs broker submit release information before a truck arrives, using a barcode label so the shipment is released on arrival.
The carrier attaches a PARS barcode to the shipment paperwork and sends the documents to the importer's customs broker, who files the release request electronically with the carrier code and the PARS number. When the truck reaches the border, the officer scans the barcode and the release is already processed. PARS is the northbound counterpart of the US PAPS process. Missing or unmatched PARS numbers are the main cause of trucks being sent to secondary. Since the ACI eManifest became mandatory, the PARS number also has to match the carrier's eManifest cargo entry.
Post-accident test
A post-accident test is a DOT drug and alcohol test required after certain crashes, such as one involving a fatality or a citation with an injury or a towed vehicle.
The rule has a decision table. A test is required after any crash with a fatality. It is also required if the driver receives a citation for a moving violation and someone is treated away from the scene, or a vehicle is towed because of disabling damage. The alcohol test should be done within two hours and must be attempted within eight; the drug test must be done within 32 hours. If a test cannot be completed, the carrier documents why. Post-accident tests are often needed at night or far from home, so a program with after-hours coordination matters more than the per-test price.
Pre-employment test
A pre-employment test is the DOT drug test with a verified negative result that a driver must have before performing any safety-sensitive function for a new employer.
Before a driver moves a commercial motor vehicle for a carrier, the carrier must receive a verified negative controlled-substances result from a DOT test. Pre-employment alcohol testing is optional. The rule applies to owner-operators hiring themselves through their own company. There is an exception when the driver was in a DOT random pool in the previous 30 days and was tested or subject to testing within the previous six months, but most carriers simply test. Since 2020 the pre-employment test is paired with a full Clearinghouse query. Using a driver without a pre-employment result is an automatic failure item at the new-entrant audit.
Process agent
A process agent is a person or company in a given state authorized to receive court papers on behalf of a motor carrier, broker or freight forwarder.
Carriers operating across state lines can be sued in states where they have no office. The process agent gives courts and plaintiffs a local address for service. Most carriers use a blanket agent company that maintains agents in all states and files the BOC-3 for them for a flat fee. The agent forwards any papers received to the carrier, so the carrier's contact details with the agent must stay current. Changing agents means filing a new BOC-3. Process agents are private businesses; the designation is filed with FMCSA but the agent is not a government office.
Prohibited status
Prohibited status means the Clearinghouse shows the driver has an unresolved drug or alcohol violation and may not perform safety-sensitive functions, including driving a CMV.
A driver enters prohibited status when an employer, MRO or C/TPA reports a positive test, a refusal or an actual-knowledge violation. The status stays until the driver completes the SAP evaluation, any treatment, and a negative return-to-duty test, all of which are recorded in the Clearinghouse. Under the Clearinghouse-II rule the state licensing agency also downgrades the driver's CDL or CLP within 60 days of a prohibited status that is not resolved. An employer who lets a prohibited driver operate faces civil penalties and, for the driver, a roadside out-of-service order.
Q
Qualified motor vehicle (IFTA)
A qualified motor vehicle under IFTA is one used in interstate travel with a gross weight over 26,000 lb, three or more axles regardless of weight, or a combination weight over 26,000 lb.
The IFTA definition sets who must hold a licence. A two-axle straight truck with a registered gross vehicle weight of 26,001 lb or more qualifies; so does any power unit with three or more axles even if it weighs less; so does a tractor and trailer combination when the combined registered weight exceeds 26,000 lb. Recreational vehicles used for personal pleasure are excluded. The test is by registration and design, not by the load on a given day. A carrier that runs a qualified vehicle across a state line without IFTA decals or a fuel trip permit is subject to a fine and can be placed out of service until a permit is bought.
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Random pool
A random pool is the group of CDL drivers from which a C/TPA or employer makes scientifically random selections for unannounced drug and alcohol tests.
FMCSA sets minimum annual random testing rates for the whole industry: 50 percent of average driver positions for controlled substances and 10 percent for alcohol in 2026. Selections must be made by a scientifically valid method, spread reasonably through the year, and each driver must have an equal chance of being picked in every draw, including drivers already tested. Small carriers join a consortium so the statistics work. A pool that tests far above the minimum rate is not more compliant; it just costs more. Missing a selection or failing to run the pool at all is a common finding at the new-entrant safety audit.
Reasonable suspicion
Reasonable suspicion testing is a DOT test ordered by a trained supervisor who has directly observed specific signs of drug or alcohol use in a driver.
A supervisor may send a driver for a reasonable-suspicion test only after observing specific, contemporaneous, articulable signs: appearance, behavior, speech or body odor. The observation must be made by a supervisor who has completed at least 60 minutes of training on alcohol misuse and 60 minutes on controlled substances. The supervisor writes down the observations. Carriers with employee drivers must have at least one trained supervisor; owner-operators with no employees do not. Reasonable-suspicion alcohol tests have the same two-hour and eight-hour windows as post-accident tests. Profirm offers the training as a two-hour session.
Return-to-duty
Return-to-duty is the process a driver must complete after a DOT violation, ending with a directly observed negative test before driving again.
A driver who tests positive, refuses a test or otherwise violates Part 382 is removed from safety-sensitive functions and enters prohibited status in the Clearinghouse. To return, the driver is evaluated by a Substance Abuse Professional, completes the education or treatment the SAP prescribes, is re-evaluated, then takes a return-to-duty test under direct observation. Only a verified negative result and the SAP report lift the prohibition. The employer, or the C/TPA for an owner-operator, records each step in the Clearinghouse. The process takes weeks at best, so it is never a same-day fix.
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Safety rating
A safety rating is FMCSA's formal finding after a compliance review that a carrier is Satisfactory, Conditional or Unsatisfactory.
Most carriers are unrated because they have never had a full compliance review. A rating is issued after an on-site or remote investigation of the carrier's records and crash history, using the safety fitness standard in Part 385. Conditional means the carrier has deficiencies that could lead to crashes; Unsatisfactory means it must stop operating after the notice period unless it corrects them. Brokers and shippers screen carriers by rating, so a Conditional rating costs freight even though it is legal to operate. The rating is separate from CSA percentiles and from the new-entrant audit result. FMCSA has proposed changes to the rating process several times.
SAMHSA-certified laboratory
A SAMHSA-certified laboratory is one certified by the Department of Health and Human Services under the National Laboratory Certification Program to analyze DOT drug test specimens.
DOT regulations allow only HHS-certified laboratories to test the urine specimens collected for DOT programs. Certification comes from the Substance Abuse and Mental Health Services Administration, which inspects labs and sends them blind performance samples throughout the year. A carrier or C/TPA cannot use a hospital lab or a workplace rapid test for a DOT test. Oral fluid testing was authorized in 2023, but as of mid-2026 no laboratory holds HHS certification for oral fluid, so urine remains the only usable DOT specimen. A vendor that says its lab is "DOT-certified" is misusing the term; certification is from HHS.
SAP (Substance Abuse Professional)
A Substance Abuse Professional is a credentialed evaluator who assesses a driver after a DOT violation and prescribes the education or treatment required before return to duty.
The SAP is independent of the employer and of the treatment provider. After a violation, the driver chooses a SAP from a list the employer must supply. The SAP does a face-to-face evaluation, recommends education or treatment, checks that the driver completed it, then does a follow-up evaluation and writes the return-to-duty and follow-up testing plan. SAPs must hold qualifying licensure and DOT-specific training. Since 2020, SAPs report the initial assessment and the completion of treatment directly in the Clearinghouse. SAP fees are paid by the driver or employer and are separate from any C/TPA fee.
Split specimen
A split specimen is the second bottle of urine collected at every DOT test, which the driver can have tested at a different laboratory after a verified positive.
At a DOT collection the urine is divided into a primary bottle and a split bottle. Only the primary is analyzed. If the MRO verifies a positive, adulterated or substituted result, the driver has 72 hours to ask the MRO for the split to be tested at a second HHS-certified laboratory. The driver may have to pay for the reanalysis in advance, although the employer must ensure the test happens regardless of payment. If the split fails to reconfirm, the result is cancelled. The 72-hour window is strict, so drivers should read the MRO's notice carefully.
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UCR (Unified Carrier Registration)
UCR is the annual federal-state registration and fee program for interstate carriers, brokers, freight forwarders and leasing companies, with fees set by fleet size.
UCR replaced the old Single State Registration System. Every interstate motor carrier, private or for-hire, plus brokers, freight forwarders and leasing companies, registers once a year in its base state and pays a fee based on the number of commercial vehicles operated. The 2026 fees run from 46 USD for 0 to 2 vehicles to 44,836 USD for 1,001 or more. The 2027 fees rise by about 20 percent and registration for 2027 opens October 1, 2026, with enforcement after January 1, 2027. There is no UCR credential to carry; enforcement checks the national database at roadside. Canadian carriers running into the US must register too.
USDOT number
A USDOT number is the unique identifier FMCSA assigns to a motor carrier, used for safety records, inspections, audits and the Clearinghouse.
Interstate carriers operating vehicles over 10,000 lb GVWR, carrying placarded hazardous materials, or carrying more than eight passengers for compensation need a USDOT number. Many states also require one for intrastate carriers. Since May 2026 the number is obtained through Motus, FMCSA's registration system, after the company official verifies identity through Login.gov. There is no government fee. The number starts the 18-month new-entrant period and sets the schedule for the biennial MCS-150 update. Canadian and Mexican carriers running into the US need a USDOT number too.
USDOT suffix
A USDOT suffix is the code FMCSA appends to a USDOT number since October 2025 to identify each type of operating authority the registrant holds.
With the end of MC docket numbers, FMCSA moved to a single identifier. A carrier with property authority and brokerage authority has one USDOT number and two suffixes. The suffix appears in the FMCSA registration record and in Motus, and it is what a broker checks to confirm a carrier is authorized to haul for hire. The suffix does not change the safety record or the biennial update schedule, which follow the USDOT number itself. Carriers with a legacy MC number see both the MC number and the suffix in their record.
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Weight-distance tax
A weight-distance tax is a state highway tax calculated on the miles a heavy vehicle travels in the state and its weight, charged in addition to fuel tax under IFTA.
Four states levy a weight-distance tax: New York, Kentucky, New Mexico and Oregon. IFTA settles fuel tax between jurisdictions but does not cover these taxes, so a carrier with an IFTA licence still needs a separate account and separate returns in each of the four states it enters. Each state has its own weight threshold, rate, filing frequency and credential. New Mexico applies to vehicles over 26,000 lb and files quarterly; Oregon applies from 26,000 lb, files monthly and may require a bond. Missing a weight-distance return typically leads to an estimated assessment and a roadside hold until it is paid.
Definitions are written by Profirm for general information and are not legal advice. Regulations change; the citation on each entry is where to confirm the current text.