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Glossary

Trucking compliance runs on acronyms. Here's what each one actually means, in plain English — follow the link on any term to the article that covers it in depth.

AOBRD — Automatic On-Board Recording Device
The legacy hours-of-service logging device that predated the ELD mandate. Carriers running AOBRDs before Dec 18, 2017 had a grandfather period until Dec 16, 2019 to switch to a full ELD.
APU — Auxiliary Power Unit
A small onboard generator that heats or cools a sleeper cab without idling the main engine — cutting fuel cost and engine wear.
BMC-84 — Freight Broker Surety Bond
The $75,000 bond a property broker must maintain on file with FMCSA, guaranteeing payment to carriers and shippers if the broker fails to pay. The bond is a shared pool — where a broker fails owing several carriers, the $75,000 is divided among all valid claims.
BMC-85 — Broker Trust Fund Agreement
The alternative to a BMC-84 surety bond: a $75,000 trust fund held by a financial institution, serving the same purpose and satisfying the same requirement.
BMC-91 — Proof of Liability Insurance Filing
The filing an insurer submits to FMCSA certifying that a carrier holds the required liability coverage. This is what activates operating authority. Distinct from the MCS-90, which is an endorsement attached to the policy and is never filed with FMCSA.
BMC-91X — Proof of Liability Insurance Filing (split coverage)
The same filing as a BMC-91, used where the required liability limit is divided across more than one insurer rather than carried by a single one.
BOC-3 — Blanket of Coverage
Designates a process agent to receive legal papers on your behalf in every state you operate in. Required to keep your operating authority active.
C/TPA — Consortium/Third-Party Administrator
The outside company that manages your mandatory random drug-and-alcohol testing program. Solo operators are legally required to join one — you cannot self-administer random testing selection.
CAP — Corrective Action Plan
The written plan FMCSA can require after a New Entrant Safety Audit finds violations — you get 30 days to submit one explaining how you'll fix them.
CDL — Commercial Driver's License
The license required to legally operate a commercial motor vehicle.
CDLIS — Commercial Driver's License Information System
The federal database used to verify a CDL holder's medical certification status electronically — often substitutes for a paper Medical Examiner's Certificate copy in a driver file.
CFR — Code of Federal Regulations
The official compilation of federal regulations; FMCSA's trucking rules live in 49 CFR.
CLP — Commercial Learner's Permit
A permit that must be held for a minimum period, with required behind-the-wheel training, before a driver can test for a CDL.
CMV — Commercial Motor Vehicle
The federal term for any truck that meets the weight, passenger, or hazmat thresholds that trigger FMCSA regulation.
CSA — Compliance, Safety, Accountability
FMCSA's program that tracks and scores your safety record — the source of the CSA scores that affect audit frequency, insurance cost, and shipper relationships.
DataQs — DataQs
The formal federal channel to dispute a violation on your CSA record that was recorded incorrectly.
DBA — Doing Business As
A registered trade name a business operates under that differs from its legal name.
DMV — Department of Motor Vehicles
The state agency that issues CDLs and, in most states, handles IRP apportioned registration.
DOT — Department of Transportation
The federal cabinet department FMCSA operates under — distinct from your USDOT number, which FMCSA (not the whole DOT) assigns you.
DQF — Driver Qualification File
The complete set of required documents proving a driver is licensed, medically fit, and qualified to operate — the single most common critical finding in FMCSA audits when incomplete.
DVIR — Driver Vehicle Inspection Report
The pre-trip and post-trip vehicle inspection record drivers complete daily, and that auditors check for corrective-action follow-through.
EIN — Employer Identification Number
The federal tax ID for your business, issued by the IRS — required before you can register for most authority and tax filings.
ELD — Electronic Logging Device
The device that electronically records a driver's hours of service, replacing paper logs for most carriers.
ELDT — Entry-Level Driver Training
Federally mandated training a new driver must complete through an FMCSA-approved provider before their first CDL — required for drivers who obtained their CDL after the federal deadline.
FF — Freight Forwarder number
A type of operating authority docket number, issued to for-hire freight forwarders.
FMCSA — Federal Motor Carrier Safety Administration
The federal agency (under the U.S. DOT) that regulates trucking safety, issues USDOT numbers and operating authority, and runs compliance audits and CSA scoring.
GCWR — Gross Combination Weight Rating
The combined weight rating of a power unit and trailer together — one of the thresholds that determines whether you need a USDOT number.
GPS — Global Positioning System
The satellite location technology behind most ELD/telematics mileage tracking and fleet fuel-card location reporting.
GVW — Gross Vehicle Weight
A vehicle's actual current weight, as opposed to GVWR (its rated maximum capacity) — used as a threshold for several tax and registration requirements.
GVWR — Gross Vehicle Weight Rating
A vehicle's rated weight capacity — one of the thresholds that determines whether you need a USDOT number.
HM — Hazardous Materials
Cargo subject to extra federal handling, labeling, and placarding rules — its own violation category in CSA scoring if you haul hazmat.
HOS — Hours of Service
The federal rules limiting how long a driver can drive and work before a required rest period.
HVUT — Heavy Vehicle Use Tax
The annual federal excise tax on trucks with a GVWR of 55,000 lbs or more, filed via IRS Form 2290.
IDEMIA — IDEMIA
The third-party identity-verification service FMCSA uses for MOTUS account access.
IFTA — International Fuel Tax Agreement
The multi-state compact that lets carriers file one combined quarterly fuel-tax return instead of filing separately in every state where fuel was purchased.
IRP — International Registration Plan
The apportioned-registration system for commercial vehicles operating in two or more states — one registration, fees split by the percentage of miles driven in each jurisdiction.
IRS — Internal Revenue Service
The federal tax agency — collects HVUT (Form 2290) and issues your EIN.
LLC — Limited Liability Company
The business entity structure most owner-operators and small carriers form before registering for authority.
MC — Motor Carrier number
The most common type of operating authority docket number, issued to for-hire motor carriers.
MCS-90 — MCS-90 endorsement
The insurance endorsement form your insurer files with FMCSA as proof of financial responsibility — required to activate your operating authority.
MCS-150 — Motor Carrier Identification Report
The biennial update form used to keep your USDOT registration current.
MEC — Medical Examiner's Certificate
The official name for the DOT medical card (Form MCSA-5876) — proof a driver passed their DOT physical.
MOTUS — MOTUS
FMCSA's online registration system for USDOT numbers, operating authority, BOC-3, and UCR filings — replaced the old FMCSA Portal, Licensing & Insurance system, and URS wizard in 2025–2026.
MPG — Miles Per Gallon
The standard fuel-economy measure — drops noticeably at highway speeds above roughly 65 mph, depending on the truck.
MRO — Medical Review Officer
The licensed physician who reviews and verifies drug test results before they're reported.
MVR — Motor Vehicle Record
A driver's official driving record from their state licensing authority, pulled at hire and reviewed annually as part of the DQF.
MX — Mexico-domiciled Carrier number
A type of operating authority docket number, issued to Mexico-domiciled for-hire motor carriers.
NRCME — National Registry of Certified Medical Examiners
The FMCSA database of examiners authorized to issue a DOT medical card — your driver's examiner must be listed on it.
NRII — National Registry II
The 2026 electronic system requiring medical examiners to report exam results to FMCSA within 24 hours, replacing the old mail-in process.
OP-1 (MX) — OP-1(MX) Application
The paper application form used specifically for Mexico-domiciled carrier operating authority (MX number), filed outside the standard online process.
OSHA — Occupational Safety and Health Administration
The federal workplace-safety agency — separate from FMCSA/DOT; some compliance-software providers track OSHA recordkeeping alongside DOT compliance.
SAFER — Safety and Fitness Electronic Records
The FMCSA public system where brokers and others look up a carrier's authority status, insurance, and safety record.
SMS — Safety Measurement System
The FMCSA system underlying CSA scoring — overhauled in 2026 to consolidate violation codes and simplify severity weighting.
TMS — Transportation Management System
Fleet/dispatch software that bundles load tracking, routing, billing, and compliance recordkeeping into one platform.
UCR — Unified Carrier Registration
The annual registration requirement for carriers, brokers, freight forwarders, and leasing companies in interstate commerce — let it lapse and your authority effectively stops working.
URS — Unified Registration System
The older FMCSA registration wizard that MOTUS replaced in 2025–2026.
USDOT — USDOT number
The unique identifier FMCSA assigns to any motor carrier, broker, or freight forwarder that meets federal size thresholds. Free to obtain; does not by itself grant hauling authority.
VIN — Vehicle Identification Number
The unique identifier for each vehicle — needed for tax filings (e.g. Form 2290 corrections) and registration.
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