GLOSSARY

Glossary of trucking terms in plain English.

From USDOT and IFTA to detention, deadhead, and driver settlements — the acronyms and terms every owner-operator and small carrier runs into, explained simply.

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Quick reference
  • DQFDriver Qualification File
  • IFTAFuel-tax agreement
  • DeadheadEmpty miles
  • DetentionWaiting fee
  • SettlementDriver pay statement
53 terms defined

Compliance & Authority

BOC-3
A federal filing that designates a process agent in each state where a carrier or broker operates, so legal documents can be served. It is required before the FMCSA grants operating authority.
DOT Number vs. MC Number
A USDOT number identifies the carrier for safety tracking; an MC number grants operating authority to haul regulated freight for hire across state lines. Many interstate for-hire carriers need both.
FMCSA
The Federal Motor Carrier Safety Administration — the U.S. DOT agency that regulates commercial trucking safety, issues operating authority, and enforces the Federal Motor Carrier Safety Regulations (FMCSRs).
IFTA
The International Fuel Tax Agreement — a system that lets interstate carriers file one quarterly fuel-tax report instead of filing in every state. Tax is apportioned based on miles driven and fuel purchased in each jurisdiction.
IRP (Apportioned Plates)
The International Registration Plan — a registration agreement that apportions a commercial vehicle’s license fees across the states and provinces it operates in, producing a single “apportioned” plate and cab card.
MC Number (Operating Authority)
A Motor Carrier (MC) number is the operating authority the FMCSA grants a carrier or broker to transport regulated freight across state lines for hire. Many for-hire interstate carriers need both a USDOT and an MC number.
MCS-150 (Biennial Update)
The form carriers file to register and update their USDOT record. FMCSA requires it to be updated at least every two years (the “biennial update”), even when nothing has changed, or the DOT number can be deactivated.
New Entrant Program
An 18-month FMCSA monitoring period for newly authorized interstate carriers. New entrants must pass a safety audit within the first months of operation to keep their authority.
UCR
The Unified Carrier Registration — an annual federal fee that interstate carriers, brokers, and freight forwarders must pay, based on fleet size. Operating without a current UCR can lead to fines and out-of-service orders.
USDOT Number
A unique identifier the Federal Motor Carrier Safety Administration (FMCSA) assigns to a commercial motor carrier. It is used to track a carrier’s safety record, inspections, crashes, and compliance reviews.
FMCSA safety tracking

Safety & Driver Files

CDL
A Commercial Driver’s License — the license required to operate a commercial motor vehicle. Classes (A, B, C) and endorsements (HazMat, tanker, doubles/triples) define what a driver may legally haul.
CSA / SMS
Compliance, Safety, Accountability (CSA) is FMCSA’s safety-enforcement program; its Safety Measurement System (SMS) scores carriers across BASIC categories using inspection and crash data to prioritize interventions.
DOT Medical Card
The Medical Examiner’s Certificate proving a driver passed a DOT physical and is medically fit to drive. It must be renewed (usually every 24 months or sooner) and kept current in the driver file.
Expiration alerts
DQF (Driver Qualification File)
The file a carrier must keep for every driver to prove they are qualified to operate. It typically includes the application, MVR, road test or CDL copy, medical card, annual review, and other required records.
Driver qualification files
Drug & Alcohol Clearinghouse
A federal database of CDL drivers’ drug and alcohol program violations. Carriers must query it before hiring and annually for current drivers, and report violations to it.
DVIR
The Driver Vehicle Inspection Report — a record of the pre-trip and post-trip inspections a driver performs, documenting any defects that could affect safe operation.
ELD
An Electronic Logging Device — hardware that automatically records a driver’s Hours of Service by connecting to the truck’s engine. Most CDL drivers subject to HOS rules are required to use a registered ELD.
HOS (Hours of Service)
The federal limits on how long a driver may drive and work before resting — for example the 11-hour driving limit and 14-hour on-duty window — designed to reduce fatigue-related crashes.
MVR (Motor Vehicle Record)
A driver’s official driving-history report from the state, showing license status, violations, and accidents. Carriers must obtain one at hire and review it at least annually.
PSP
The Pre-Employment Screening Program — an FMCSA report that lets carriers review a driver applicant’s five-year crash and three-year inspection history before hiring.
Safety Audit
A review FMCSA conducts on new entrants (and other carriers) to verify they have the required safety-management systems and records — driver files, drug/alcohol program, HOS, maintenance, and more.
DOT audit prep

Operations & Freight

Backhaul
A load hauled on the return trip toward a truck’s home base, used to avoid deadheading and turn empty return miles into revenue.
Bobtail
Driving a tractor without a trailer attached. “Bobtail insurance” covers the truck during those non-loaded, non-dispatched movements.
BOL (Bill of Lading)
The legal document between a shipper and carrier that lists the freight, terms, and destination. It serves as a receipt, a contract of carriage, and a document of title.
Broker
A licensed intermediary that arranges freight between shippers and carriers for a fee, without taking possession of the goods. Brokers must hold a $75,000 surety bond (BMC-84).
Consignee
The receiver — the party to whom the freight is delivered, named on the bill of lading.
Deadhead
Miles driven with an empty trailer — typically between delivering one load and picking up the next. Deadhead miles cost fuel and time without generating revenue.
Detention
A fee charged when a driver is held at a shipper or receiver beyond the free loading/unloading window (often two hours). It compensates for lost driving time.
Accessorials in settlements
Drayage
Short-haul transport of containers or freight, usually between a port or rail yard and a nearby warehouse or terminal.
FTL vs. LTL
Full Truckload (FTL/TL) means one shipment fills the trailer for a single customer; Less-Than-Truckload (LTL) combines multiple smaller shipments from different customers in one trailer.
Layover
A fee paid when a driver is forced to wait overnight or a full day due to loading, unloading, or scheduling delays outside the driver’s control.
Load Board
An online marketplace where brokers and shippers post available freight and carriers find loads to haul. Examples include DAT and Truckstop.
Lumper Fee
A charge for third-party labor that loads or unloads the trailer, common at grocery and food warehouses. Carriers often front the cost and get reimbursed by the broker or shipper.
POD (Proof of Delivery)
A signed document confirming the consignee received the freight. Carriers usually must submit the POD (often the signed BOL) to get paid or to release a factoring advance.
Rate Confirmation
The document (“rate con”) a broker sends confirming the agreed rate, pickup/delivery details, and terms for a specific load. It becomes the basis for the carrier’s invoice.
Shipper
The party (often a manufacturer or supplier) that owns the freight and tenders it to a carrier or broker for transport.

Pay & Settlements

Accessorials
Extra charges beyond the base linehaul rate — detention, layover, lumper, tarping, stop-offs, and fuel surcharge — that get added to a load’s pay.
Chargeback
A deduction taken from a driver’s or owner-operator’s settlement for items like insurance, tolls, damage, or equipment — itemized so the driver can see what was withheld and why.
CPM (Cents Per Mile)
A pay model that pays a driver a set number of cents for each mile driven. It’s one of the most common ways company drivers are compensated.
Driver Settlement
The pay statement that reconciles what a driver earned for a period against deductions (advances, insurance, escrow, chargebacks), producing the net amount paid. Common for owner-operators and percentage/mileage drivers.
Automated settlements
Escrow (Maintenance Escrow)
Money withheld from an owner-operator’s settlements and held by the carrier to cover future maintenance, damages, or lease obligations, refundable under the lease terms.
Factoring
Selling unpaid freight invoices to a factoring company at a small discount to get paid within a day instead of waiting 30–60 days. It smooths cash flow for small carriers.
Fuel Surcharge
An adjustable charge added to freight rates to offset fuel-price swings, usually tied to the national average diesel price.
Lease-On
When an owner-operator operates under a carrier’s authority and insurance in exchange for a share of revenue, rather than running under their own MC number.
Owner-Operator
A driver who owns their truck and runs it as a business — either under their own authority or leased onto a carrier. Owner-operators are typically paid by settlement, not payroll.
Per Diem
A daily allowance for meals and incidental expenses while a driver is away from home, which can carry tax advantages for over-the-road drivers.
Percentage Pay
A pay model where the driver earns a percentage of the load’s revenue (often 25–75%). Common for owner-operators leased onto a carrier.

Equipment

APU
An Auxiliary Power Unit — a small onboard engine or battery system that powers a truck’s cab (heat, AC, electronics) without idling the main engine, saving fuel.
Dry Van
An enclosed, non-refrigerated trailer — the most common trailer type — used for palletized and boxed general freight.
Flatbed
An open trailer with no sides or roof, used for oversized, heavy, or awkward loads like machinery, steel, and lumber that require tarping and strapping.
GVWR
Gross Vehicle Weight Rating — the maximum loaded weight a vehicle is designed to carry, set by the manufacturer. It helps determine CDL and regulatory requirements.
Preventive Maintenance (PM)
Scheduled, mileage- or time-based servicing (oil, brakes, tires, inspections) that keeps a truck DOT-ready and reduces breakdowns and out-of-service violations.
Maintenance records
Reefer
A refrigerated trailer used to haul temperature-controlled freight like produce, meat, or pharmaceuticals.

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