DOT Audit Prep

Trucking Compliance Glossary

A plain-language glossary for DOT audit prep terms such as DQ, HOS, ELD, MVR, DVIR, CSA, BASICs, UCR, IRP, and IFTA.

Who this is for
New authorities, Owner-operators, Office staff
Written by
Dale Whitfield
Reviewed by
DOT Audit Prep Editorial Team
Last reviewed
2026-06-16
Source confidence
Medium

Quick checklist

  • Use this glossary when a notice, checklist, or vendor conversation uses an abbreviation you do not recognize.
  • Match each term to the corresponding record category in your audit packet so file names and labels are consistent.
  • Do not use internal shorthand when naming files for a reviewer — spell out the category or use the standard abbreviation.
  • Teach backup staff the terms tied to their specific record area so they can respond accurately when the audit contact is unavailable.
  • Pay attention to the difference between program names (CSA, SMS) and formal determinations (safety rating) — they are not the same thing.

Why this matters

New authorities encounter a large amount of regulatory shorthand before they understand what the underlying records look like. A DQ file is not the same as a driver application. CSA is a monitoring program, not a safety rating. An ELD is the device; HOS is the rule system it records. Getting the terms right matters because carriers that misidentify a record type during an audit create confusion that slows the review — and because staff who manage records need to know what a TPA is expecting when they ask for proof of enrollment. This page is a practical reference for the abbreviations most likely to come up in a notice, a checklist, or a vendor conversation.

What to prepare

Area Records to gather
Driver and vehicle terms
  • DQ (Driver Qualification): the set of records a carrier must maintain to show each driver meets minimum qualification standards under 49 CFR Part 391
  • MVR (Motor Vehicle Record): a state-issued driving record; required for pre-employment screening and at each annual review under 49 CFR 391.23 and 391.25
  • DVIR (Driver Vehicle Inspection Report): a driver-completed inspection form under 49 CFR 396.11; defects must be signed off by the carrier or mechanic
  • HOS (Hours of Service): federal limits on driver on-duty and driving time under 49 CFR Part 395; violations appear in the HOS Compliance BASIC
  • ELD (Electronic Logging Device): a device required by 49 CFR Part 395 Subpart B to automatically record hours of service for most CDL drivers operating in interstate commerce
  • CMV (Commercial Motor Vehicle): a vehicle that meets the weight, passenger, or hazmat thresholds that trigger federal safety regulations
Program and agency terms
  • DER (Designated Employer Representative): the carrier's named contact for drug and alcohol testing matters; receives test results from the MRO and takes required actions under 49 CFR Part 382
  • MRO (Medical Review Officer): a licensed physician who reviews and verifies drug test results under DOT testing rules
  • TPA (Third-Party Administrator): a service provider that may manage drug testing administration, consortium enrollment, or DQ file services on the carrier's behalf
  • CSA (Compliance, Safety, Accountability): FMCSA's enforcement and compliance program that uses roadside inspection and crash data to prioritize interventions
  • SMS (Safety Measurement System): the FMCSA data system that calculates carrier BASIC percentiles based on inspection, violation, and crash history
  • BASICs (Behavior Analysis and Safety Improvement Categories): the seven SMS measurement categories — Unsafe Driving, Crash Indicator, HOS Compliance, Vehicle Maintenance, Controlled Substances/Alcohol, Hazardous Materials Compliance, and Driver Fitness
Registration and tax terms
  • USDOT Number: the federal carrier identification number assigned by FMCSA; required for interstate motor carriers
  • MC Number (Motor Carrier Number): an operating authority number required for carriers that transport regulated commodities or passengers for hire in interstate commerce
  • MCS-150 (Motor Carrier Identification Report): the FMCSA registration form carriers must update at least biennially under 49 CFR 390.19
  • UCR (Unified Carrier Registration): an annual registration and fee program for interstate carriers, brokers, and freight forwarders
  • IRP (International Registration Plan): a reciprocal registration agreement that allows apportioned registration for vehicles operating in multiple member jurisdictions
  • IFTA (International Fuel Tax Agreement): a fuel tax reporting agreement that allows carriers to file fuel tax returns in their base jurisdiction for all IFTA member jurisdictions

Common gaps

  • A TPA or testing consortium asks who the DER is and no one at the carrier knows the term or has been designated.
  • The DQ file and the driver application are treated as the same thing — the application is one document inside the DQ file, not the file itself.
  • CSA percentiles and safety ratings are used interchangeably in internal conversations, leading to misunderstanding of what a finding actually means.
  • IFTA and IRP registration documents are filed with safety records with no label or category separation.

Before / During / After audit

Before

  • Add standard abbreviations to your packet index so file categories use consistent labels.
  • Use full names in file folder headings when training new office staff.

During

  • Ask for clarification in writing if a record request uses a term that does not match your internal labels.

After

  • Update internal file naming conventions to match standard terms.
  • Keep this glossary in the onboarding folder for dispatch and office staff.

FAQ

What is the difference between a DQ file and a driver application?

A driver application is one document — the form a driver completes before employment, required under 49 CFR 391.21. A DQ (driver qualification) file is the complete set of records the carrier must maintain for each driver, including the application, MVR, road test, medical certificate, annual reviews, pre-employment drug test, and any safety performance history inquiry responses. The application starts the file; the file is what the auditor reviews.

What does BASIC stand for and how does it affect a carrier?

BASIC stands for Behavior Analysis and Safety Improvement Category. The seven BASICs in the FMCSA Safety Measurement System group violations from roadside inspections into safety areas: Unsafe Driving, Crash Indicator, Hours-of-Service Compliance, Vehicle Maintenance, Controlled Substances/Alcohol, Hazardous Materials Compliance, and Driver Fitness. A carrier with a high percentile in one or more BASICs may receive FMCSA attention, including a warning letter, targeted inspection, or a compliance review. The percentile is a monitoring tool, not a safety rating.

Does every carrier need a DER?

If the carrier is subject to 49 CFR Part 382 drug and alcohol testing requirements — which generally applies to CDL drivers operating commercial motor vehicles in interstate commerce — the carrier must have a DER. The DER is the person the testing laboratory, MRO, and TPA contact when a test result requires action. An owner-operator can be their own DER. For carriers using a consortium, the DER is still the carrier's named representative, not the consortium staff.

Download

Use the print button to create a paper or PDF copy from your browser. No account or upload is needed.

Sources

FMCSA · official

FMCSA Registration

Registration, operating authority, and USDOT number resources.

Last checked: 2026-06-16

FMCSA · official

CSA - Measure

FMCSA description of SMS, BASICs, and how CSA measures carrier safety performance.

Last checked: 2026-06-16

Related resources

New Authority Audit PrepA startup-friendly audit prep guide for new trucking authorities setting up DOT compliance records early.Audit Document PacketBuild a DOT audit document packet with the driver, vehicle, HOS, drug testing, accident, and authority records auditors often request.Safety Ratings and CSA BasicsA plain explanation of FMCSA safety ratings, CSA BASICs, and why audit findings can matter after the document review.