Carrier TMS & trucking glossary (2026)

A

ACE / eManifest #: Automated Commercial Environment — the U.S. Customs and Border Protection system carriers use to file electronic manifests (eManifest) for cross-border loads to and from Canada and Mexico. Filing is mandatory for commercial shipments. Auto-hauler and hazmat carriers see ACE features surface in the TMS.
Accessorial #: Any charge billed in addition to the base linehaul rate — detention, layover, lumper, tarp pay, fuel surcharge, driver assist. A real TMS lets you configure accessorials per customer or per lane and auto-add them to the rate confirmation.
API #: Application Programming Interface — the programmatic way one system talks to another. A documented REST API lets you wire the TMS to BI tools, custom dashboards, or third-party services. We score API depth as part of our 77-feature rubric.
AP / AR / GL #: Accounts Payable / Accounts Receivable / General Ledger — the three core accounting modules. Some TMS (McLeod, Axon) ship native AP/AR/GL designed to retire QuickBooks. Most others integrate with QuickBooks rather than replace it. See our QuickBooks matrix.

B

Backhaul #: A return load picked up after the primary delivery to avoid running empty (deadhead) back to base. Skilled dispatch finds backhauls; rookie dispatch deadheads home. The opposite is headhaul.
BIPD #: Bodily Injury / Property Damage — the auto-liability insurance carrier minimum required by FMCSA: $750,000 for general freight, $1M for hazmat household goods, $5M for placardable hazmat. Distinct from cargo insurance, which covers the freight itself rather than third-party harm.
Bobtail #: A tractor running without a trailer attached. Common between deliveries and the next pickup. "Bobtail insurance" specifically covers a tractor when it's not pulling.
BOL #: Bill of Lading — the contract between shipper and carrier that legally documents the freight, origin/destination, parties, and terms of transport. Required at every load. The signed BOL becomes the POD on delivery.
Broker #: A licensed intermediary that arranges freight between shippers (who have loads) and carriers (who have trucks). Brokers don't own trucks. Carriers haul broker freight via load boards (DAT, Truckstop) or established direct relationships.

C

CDL #: Commercial Driver's License — required for any driver operating a commercial vehicle > 26,001 lbs GVWR or carrying hazmat. Class A allows tractor-trailers; Class B is straight trucks; Class C covers smaller vehicles with hazmat or 16+ passengers.
Carrier #: A licensed motor carrier — the company that owns or leases trucks and physically moves the freight. This site exclusively reviews TMS for the carrier side, not the broker side or shipper side.
Cargo insurance #: Insurance covering loss or damage to freight while in the carrier's custody. Most contracts require $100,000 minimum. Reefer and high-value cargo often require higher limits. Distinct from BIPD (auto liability).
Chassis #: In intermodal / drayage, the wheeled frame that holds an ocean container during over-the-road transport. Chassis are typically not owned by the carrier — they're leased from chassis pools (TRAC, FlexiVan, etc.) with per-diem fees after free-time runs out.
Class break (LTL freight class) #: In LTL, the rate-table boundary where a shipment's freight class changes (e.g., density-based class 70 → 85). A 200-lb increase that crosses a class break can move the rate materially. Real LTL TMS show class breaks during quoting; FTL TMS don't.
Consignee / Consignor #: Receiver and shipper, respectively. The consignor ships the freight; the consignee receives it. Both names appear on the BOL.
Container #: The 20' or 40' steel ocean container hauled on a chassis in intermodal moves. Tracked by container number; subject to last-free-day rules and demurrage.
CSA #: Compliance, Safety, Accountability — the FMCSA program that scores carriers on seven Behavior Analysis and Safety Improvement Categories (BASICs). Bad CSA scores trigger DOT audits and lose loads — brokers screen carriers on CSA.

D

DAT #: The largest freight load board in North America. DAT One, DAT Power, RateView, and post-2024 the Convoy Platform. Native TMS integration is the difference between dispatchers re-keying loads all day vs. one-click import. See our DAT integration matrix.
Day cab #: A tractor without a sleeper berth — designed for regional / short-haul work where the driver returns home daily. Contrast with sleeper cab, used for OTR (over-the-road) operations.
Deadhead #: Driving with an empty trailer between loads. Deadhead miles cost fuel and driver time without revenue. A real TMS surfaces deadhead percentage as a KPI; cutting it is dispatcher craft.
Demurrage #: In intermodal, the fee charged by the steamship line when a container sits at the port past its last-free-day. Often $150+/day per container. Drayage TMS must surface demurrage clocks to avoid surprise charges.
Detention #: A fee a carrier charges when a driver waits at a shipper or consignee past free time (typically 2 hours). Real detention pay collection is an AR battle — the TMS must produce time-stamped arrival/departure evidence, often pulled from the ELD.
Dispatcher / Dispatch #: The role responsible for matching trucks to loads, negotiating rates with brokers, and managing drivers in motion. Dispatch is the workflow most exposed to TMS UI quality — every shortcut counts at scale.
DOT #: Department of Transportation. The federal regulatory body. Carriers operate under a USDOT number; FMCSA is DOT's motor-carrier arm.
Drayage #: Short-haul container moves between ocean ports / rail terminals and consignee or origin warehouses. Operationally distinct from FTL — see our intermodal / drayage TMS picks.
Driver settlement #: The pay run for drivers — per-mile, percentage, hybrid, or salaried, with deductions for fuel advances, occupational accident insurance, escrow, and other items. Settlement edge cases (mid-period bonuses, reversed advances) reveal TMS depth.
DVIR #: Driver Vehicle Inspection Report — the FMCSA-required pre-trip and post-trip inspection record. Modern ELD/telematics systems capture DVIRs digitally; the TMS surfaces them in maintenance workflows.

E

EDI #: Electronic Data Interchange — the structured-message protocol carriers use to exchange load tenders, status updates, and invoices with brokers and shippers. Required for most large shipper relationships (Walmart, Kroger, etc.). EDI traffic flows through a Value-Added Network (VAN).
EDI 204 #: The Motor Carrier Load Tender — a broker or shipper sends this to a carrier offering a load. The carrier responds with an EDI 990 accept or reject.
EDI 990 #: Response to Load Tender — the carrier's accept or reject of a 204. Many shipper SLAs require a 990 response within 5 minutes — a real test of EDI readiness.
EDI 214 #: Shipment Status Message — sent from carrier to broker/shipper at status change events: dispatched, arrived shipper, loaded, departed, arrived consignee, delivered. Real EDI 214 flow comes from the ELD/telematics, not manual dispatcher entry.
EDI 210 #: Motor Carrier Freight Details and Invoice — sent from carrier to broker after delivery to invoice the load. Closes the EDI loop. The TMS must produce a clean 210 with all accessorials and supporting documents auto-attached.
ELD #: Electronic Logging Device — FMCSA-mandated hardware tracking driver hours-of-service. The major ELD vendors are Samsara, Motive, and Geotab. ELD-to-TMS integration depth determines whether dispatch sees live HOS or stale spreadsheet data.
ePOD #: Electronic Proof of Delivery — a digital signature + photo capture replacing the paper signed BOL. Captured from the cab on the driver app. Faster invoicing, fewer claim disputes. See POD.

F

Factor / Factoring #: A financial company that buys carrier invoices at a discount (typically 1.5–4%) and pays the carrier in 24 hours instead of net-30. Carriers factor when cash flow can't wait for broker payment. See our factoring TMS matrix for which TMS integrate with Apex, RTS, OTR, TBS, Triumph, Bobtail, and eCapital.
Flatbed #: Open-deck freight — steel, lumber, machinery, oversize loads. Adds tarping, securement, and per-state oversize permits to the operational stack. See our flatbed TMS picks.
FMCSA #: Federal Motor Carrier Safety Administration — the DOT agency that regulates interstate trucking. FMCSA sets HOS rules, requires ELDs, scores carriers via CSA, and licenses carriers/brokers (MC# / USDOT).
FTL #: Full Truckload — a single shipment that fills (or pays for) the entire trailer. The dominant carrier mode in North America; every TMS supports it. See our FTL picks by fleet size.
Fuel surcharge #: A separately-billed accessorial that adjusts for diesel price changes, often pegged to the DOE weekly retail diesel index. Most contracts include a fuel-surcharge tariff. The TMS applies it automatically per lane or per customer.

H

HazMat #: Hazardous materials — chemicals, fuels, explosives, radioactives. Subject to placarding, route restrictions, driver endorsement requirements, and incident-response rules. See our hazmat TMS picks.
HazMat endorsement #: A CDL endorsement (the "H" or "X" endorsement) required for drivers hauling placarded hazmat. Requires TSA background check plus written test. A TMS that's hazmat-credible blocks dispatch on drivers with expired endorsements.
HOS #: Hours of Service — the FMCSA-mandated limits on driver duty hours. Property-carrying drivers: 11 hours driving in a 14-hour window, 70 hours in 8 days, with mandatory 30-min break and 10-hour off-duty period. Tracked automatically by the ELD; surfaced in the TMS for HOS-aware dispatch.

I

IFTA #: International Fuel Tax Agreement — a fuel-tax compact among 48 U.S. states + 10 Canadian provinces. Carriers report fuel purchases and miles per jurisdiction quarterly; the TMS calculates owed tax and produces the filing. Manual IFTA can eat 8–12 hours/quarter; automated IFTA from ELD fuel data is a game-changer for owner-operators.
Intermodal #: Multi-mode shipments combining truck + rail + ocean. The drayage carrier handles the truck legs to/from rail or port. See our intermodal TMS picks — eModal, Rail Inc, and chassis-pool integration matter.
IRP #: International Registration Plan — the multi-state apportioned registration system. Carriers register a base plate that's valid in all member states/provinces; fees apportion by miles per jurisdiction. Often paired with IFTA reporting.

L

Last-free-day #: In intermodal, the deadline before demurrage begins to accrue on a container at the port or rail terminal. Drayage TMS must surface impending last-free-day to avoid surprise demurrage bills.
Layover #: Time a driver spends waiting between dispatched legs (often overnight). Many contracts pay layover after 24 hours. Distinct from detention (waiting at a shipper or consignee).
Linehaul #: The over-the-road portion of a load — origin to destination, exclusive of accessorials. In LTL hub-and-spoke, linehaul is the long-haul leg between terminals; pickup and delivery are P&D.
Load board #: An online marketplace where brokers post loads and carriers post available trucks. The two dominant boards are DAT and Truckstop. Native TMS integration converts find-and-book from a manual workflow into a one-click flow.
LTL #: Less-than-Truckload — multi-shipment freight where each load uses part of a trailer. Requires NMFC class-based pricing, hub-and-spoke linehaul, and proportional billing — features that most modern small-fleet TMS lack. See our LTL picks.
Lumper #: A third-party load/unload service at a shipper or warehouse, often required by larger shippers (especially grocery DCs). Lumper fees are a separate accessorial billed back to the broker or shipper.

M

MC# #: Motor Carrier number — the FMCSA-issued operating-authority number. Every for-hire carrier or broker has one. Often paired with the USDOT number on rate cons and BOLs. Brokers screen carriers by MC# (and CSA scores).

N

NMFC #: National Motor Freight Classification — the system that assigns LTL freight to one of 18 classes (50 to 500) based on density, stowability, handling, and liability. Classes drive LTL rates. Real LTL TMS ship NMFC class engines (McLeod, Trimble, PCS); FTL TMS treat freight as generic loads.

O

OS&D #: Over, Short, and Damaged — the three claim types at delivery. Over: more than the BOL says. Short: less than the BOL says. Damaged: physically harmed in transit. Reefer carriers see OS&D claims tied to temperature excursions — which is why reefer TMS picks emphasize claim-grade temp logs.
Owner-Operator #: A solo driver who owns (or leases) their truck and operates under their own authority or leased-on to a carrier. Distinct economic profile from company drivers. See our owner-op TMS picks.

P

Per-diem #: Two meanings depending on context. Driver per-diem: a non-taxable daily meal/lodging allowance (IRS-set rate). Chassis per-diem: the fee a chassis pool charges per day after free-time. Drayage TMS must distinguish both.
POD #: Proof of Delivery — the signed BOL plus any delivery documents (driver signature, consignee signature, time-stamped photos). The POD anchors invoice payment; without it, brokers refuse to pay. ePOD is the digital form.
Power unit #: The tractor — the engine-bearing vehicle that pulls a trailer. Distinct from "trailer" (the cargo half) and "asset" (could be either). Most TMS data models distinguish power units, trailers, and chassis.

Q

Quick-pay #: A broker option to pay the carrier in 1–2 days instead of net-30, in exchange for a discount (typically 1.5–3%). Distinct from factoring — quick-pay is direct broker-to-carrier; factoring routes through a third-party finance company.

R

Rate confirmation (rate-con) #: The signed contract between broker and carrier confirming the load — origin, destination, rate, accessorials, requirements. The rate-con anchors the load record; modern TMS auto-extract data from rate-con PDFs via OCR.
Reefer #: Refrigerated freight or a refrigerated trailer. Temperature-sensitive freight (food, pharmaceuticals) requires continuous temp telemetry, claim-grade logs, and ideally two-way reefer-unit control. See our reefer TMS picks.
RMIS #: Truckstop's carrier-onboarding and compliance product, integrated into ITS Dispatch. Surfaces broker credit days and score inline — when integrated, can block dispatchers from booking loads from no-pay brokers. See our Truckstop matrix.

S

SMC3 #: The data company providing NMFC freight-class data and LTL rating tools (CzarLite, Czar D83). LTL-credible TMS integrate SMC3 / Czar tariff data natively. Without it, an "LTL TMS" is just a multi-stop FTL TMS.
Spot rate / Contract rate #: Two pricing modes. Spot: one-off market rate negotiated per-load on load boards. Contract: a pre-negotiated rate over a period (often a year), typically lower than spot but more stable. Most carriers run a mix.

T

Tanker / Bulk #: Liquid or dry-bulk freight — fuel, chemicals, food-grade liquids, frac sand. Layers hazmat, TWIC, and washout history on top of FTL. See our tanker TMS picks.
Tariff #: A pricing schedule. Two common contexts: fuel surcharge tariff (price-per-mile adjustment by diesel index); LTL tariff (rate tables by NMFC class, weight break, and lane). Tariff data is paid (SMC3 / Czar) — one reason real LTL is hard to ship in modern small-fleet TMS.
TMS #: Transportation Management System — the operational software that runs a carrier's dispatch, settlements, accounting, and customer/load workflow. The subject of this entire site. See our top-rated TMS ranking.
Trailer #: The cargo-carrying half of the truck combination. Dry van, reefer, flatbed, tanker, container chassis. Distinct from power unit (the tractor). TMS data models track trailers as separate assets.
Truckstop #: DAT's main competitor in load boards — and uniquely also owns ITS Dispatch (a vertically-integrated freight platform). Beyond the load board, Truckstop sells RMIS (carrier vetting), broker tools, and the Book It Now instant-book product. See our Truckstop matrix.
TWIC #: Transportation Worker Identification Credential — TSA-issued biometric ID required for unescorted access to secure port facilities. Critical for tanker and intermodal carriers serving ports. A real TMS tracks per-driver TWIC expirations.

U

USDOT number #: The Department of Transportation's carrier identifier, displayed on every commercial truck. Paired with the MC# for for-hire carriers. Used for FMCSA registration, audits, and CSA scoring.