Trucking Terms Guide

Sources

The site uses plain operational explanations for general freight vocabulary. For regulated or higher-risk topics — compliance filings, insurance requirements, fuel tax, vehicle registration, and hours-of-service rules — definitions are checked against official agency pages, insurance reference material, and public industry resources before publication.

The sources below are the primary references used for technical and regulated content. Where a definition depends on a specific agency rule, specification, or official glossary, the relevant term page may also link directly to the source material. Sources are verified against the linked page at publication and re-checked when we update content in the affected category. Last-verified dates reflect when the source was checked for the most recent category-wide review.

FMCSA and federal trucking regulation

  • FMCSA registration resources — Used for: operating authority, DOT number, MC number, BOC-3, UCR, and MCS-150 filing guidance. Also the primary source for definitions of motor carrier, freight broker, and freight forwarder authority types. Last verified: May 2026.
  • FMCSA hours-of-service summary — Used for: HOS rules for property-carrying drivers, 11-hour driving limit, 14-hour on-duty window, 70-hour weekly limit, 34-hour restart, split sleeper berth provision, adverse driving conditions exception, and short-haul exception. Content reflects the September 2020 HOS final rule. Last verified: May 2026.
  • FMCSA electronic logging devices — Used for: ELD mandate scope, ELD certification requirements, exemptions, driver and carrier obligations, supporting documents rules, and the relationship between ELD records and RODS. Last verified: May 2026.
  • FMCSA commercial driver's license information — Used for: CDL class requirements (Class A, B, C), endorsement types (H, N, P, S, T, X), medical certification, entry-level driver training (ELDT) requirements effective February 2022, and disqualification rules. Last verified: May 2026.
  • FMCSA Drug and Alcohol Clearinghouse — Used for: federal database scope for CDL driver drug and alcohol violations, pre-employment and annual query requirements for employers, driver registration obligations, and return-to-duty process definitions. Last verified: May 2026.
  • FMCSA Training Provider Registry — Used for: registered CDL training providers that meet entry-level driver training requirements, TPR registration process, and how carriers verify training provider eligibility. Last verified: May 2026.
  • FMCSA definitions of motor carrier, broker, and freight forwarder authorities — Used for: distinguishing between carrier operating authority, broker property authority, and freight forwarder authority; the prohibition on acting as both carrier and broker on the same transaction. Last verified: May 2026.
  • FMCSA insurance filing requirements — Used for: minimum insurance amounts for different carrier types, Form BMC-91 and BMC-91X filing, cargo insurance minimums, and proof of insurance requirements for authority applications. Last verified: May 2026.

Equipment and freight classification

  • FHWA freight glossary — Used for: federal freight transportation vocabulary and definitions, intermodal terminology, and freight mode definitions. Also used as a secondary reference for general freight operations terms. Last verified: May 2026.
  • NHTSA GVWR and GAWR definitions — Used for: gross vehicle weight rating (GVWR) and gross axle weight rating (GAWR) technical definitions for equipment terms. Last verified: May 2026.
  • FMCSA gross combination weight rating definition — Used for: GCWR technical definition for tractor-trailer combination weight rating terms. Last verified: May 2026.
  • NMFTA freight class explanation — Used for: NMFC classification system, freight class factors (density, stowability, handling, liability), density-based rating, and freight class number ranges. Last verified: May 2026.

Fuel tax and vehicle registration

  • International Fuel Tax Agreement — Used for: IFTA member jurisdictions, quarterly reporting requirements, license and decal requirements, mileage record standards, and the base jurisdiction concept. Last verified: May 2026.
  • International Registration Plan — Used for: IRP apportioned registration, cab card requirements, apportioned plate definitions, participating jurisdiction list, and the fleet registration apportionment formula. Last verified: May 2026.
  • U.S. Energy Information Administration diesel fuel data — Used for: diesel retail price data referenced in fuel card and fuel surcharge definitions; the EIA weekly on-highway diesel price series is the most widely referenced fuel surcharge index in trucking. Last verified: May 2026.

Insurance

  • NAIC consumer insurance glossary — Used for: insurance terminology reference for coverage types, policy structure, and claims vocabulary. Used alongside FMCSA insurance filing requirements for trucking-specific insurance terms. Last verified: May 2026.

Tax and self-employment

  • IRS self-employed individuals tax center — Used for: Schedule C filing, self-employment tax calculation, quarterly estimated tax payment requirements, and deduction categories for self-employed filers including owner-operators. Last verified: May 2026.
  • IRS Topic 511: business travel expenses — Used for: per diem rates for meals and incidentals, the 80% meal deduction limit for transportation workers, and the distinction between actual expense and standard per diem methods for truckers. Last verified: May 2026.

CB radio and communications

  • eCFR Citizens Band radio service rules — Used for: FCC rules governing CB radio operation — channel assignments, power limits, antenna restrictions, and prohibited uses — referenced when CB slang definitions require regulatory context. Last verified: May 2026.

How sources are maintained

Sources are checked when definitions are first published and re-verified when content in a category is updated. For FMCSA regulatory topics, sources are checked against the current version of the relevant CFR section when we update HOS, ELD, CDL, or compliance definitions. IFTA and IRP sources are checked against the current member jurisdiction agreements. EIA diesel data links are verified when fuel-related content is updated.

When a linked source changes its URL, content, or structure in a way that affects the referenced definition, the source link and the associated definition are both reviewed and updated. If a definition depends on source material that has changed, the definition is corrected to reflect the current rule or classification before the source link is updated.