The acronyms, the inspections, the scoring — explained

FMCSA's nationwide enforcement and safety-monitoring program. The umbrella; SMS is the scoring engine inside it.

The DOT agency that writes and enforces commercial truck/bus safety regulations.

The parent cabinet department. FMCSA is one agency within DOT.

A vehicle ≥10,001 lbs GVWR, designed for ≥9 passengers (incl. driver), or used to haul placarded hazmat. If it's a CMV, FMCSA rules apply.

Free, unique identifier assigned to a carrier for safety monitoring. Every interstate carrier needs one.

Separate operating authority required for for-hire interstate carriers (and certain hazmat/passenger ops). Variants: MC, FF, MX.

Full license to operate a CMV solo. Issued by states under federal standards.

Practice permit — holder must drive only with a CDL-holding instructor in the cab. Valid 12 months; must be held ≥14 days before CDL skills test.

Federal rules limiting driving and on-duty time for CMV drivers (49 CFR Part 395).

The daily log of driving / on-duty not driving / sleeper / off-duty time. Was paper logbooks; now mostly ELDs. Retain 6 months.

Informal label for paper-logbook RODS. The official acronym is RODS — treat RDP as a synonym.

Auto-records RODS data from the truck's engine. Mandatory since Dec 18, 2017 for most drivers. Must appear on FMCSA's registered ELD list.

The driver-prepared end-of-day report listing any safety-affecting defect (49 CFR 396.11). Retain DVIRs with defects + repair certs for 3 months. "No-defect" DVIRs are no longer required for property carriers.

The form the officer fills out after a roadside inspection. Lists inspection level, violations, and any OOS orders. Driver must deliver a copy to the carrier ASAP.

A condition serious enough that the driver, vehicle, or both cannot move until corrected. Defined by CVSA's North American OOS Criteria (updated every April 1).

The formal declaration on a DVER prohibiting operation. Adds +2 to the violation's severity weight in SMS.

Non-profit that writes the inspection standards and OOS criteria used across the U.S., Canada, and Mexico.

FMCSA's data engine that crunches inspection and crash data into BASIC percentiles. The actual "score" tool.

One of the seven categories SMS scores carriers on — see the BASICs section below.

FMCSA's spreadsheet listing every violation code, which BASIC it maps to, and its 1–10 severity weight. The authoritative violations list — what VioCodes indexes.

1–10 number per violation reflecting its crash-risk contribution within its BASIC. OOS adds +2. Capped at 30 per inspection per BASIC before time weighting.

Multiplier based on age: 3 (0–6 mo), 2 (6–12 mo), 1 (12–24 mo), 0 (>24 mo — drops off).

The 0–100 score officers see at roadside, derived from SMS. Tells them to pass, inspect, or optionally inspect a truck.

FMCSA portal (dataqs.fmcsa.dot.gov) where carriers or drivers challenge wrong inspection, crash, or violation data.

Master FMCSA database holding registration, inspections, crashes, and reviews. SMS and PSP both read from MCMIS.

$10 driver report pulled from MCMIS: 5 yrs of crashes + 3 yrs of inspections. Used in hiring. Cuts crash rate ~8% and OOS rate ~17% on average.

Personnel file required for every driver under 49 CFR 391.51 (application, MVR, road test, med cert, annual MVR review, etc.). Retain for employment + 3 yrs.

Driving record pulled from the state licensing agency. Required at hire and annually thereafter.

FMCSA database of CDL driver drug/alcohol violations. Pre-employment full query + annual limited query for every active CDL driver. Violations stay ≥5 yrs.

Apportioned vehicle-registration agreement among U.S. states + Canadian provinces. One registration; fees split by miles per jurisdiction.

Quarterly fuel-tax reporting among 48 states + Canadian provinces. One license; base state redistributes taxes.

Cargo classified as dangerous under 49 CFR 100–185. Triggers placarding, special endorsements, and the HM Compliance BASIC.

Steamship lines / chassis pools that supply chassis or trailers for intermodal moves. Must register with FMCSA, get a USDOT #, mark each chassis, and maintain it.

Canada's equivalent of FMCSA safety regulations. Relevant for cross-border operations.

Mandatory safety audit during a new carrier's first 18 months (usually within 12). Missing a drug/alcohol program is an auto-fail.

The big on-site comprehensive investigation. Multiple days, all BASICs, full FMCSR review. Results in a safety rating.

Document-only review. Auditor requests records; no on-site visit. Lower friction; used for narrower issues.

Auditor comes on-site but targets specific BASIC(s) — e.g. just HOS or just driver files. About half of FMCSA audits in recent years.

Suffix on a 49 CFR 392.2 violation indicating a state/local speed-law citation. e.g., 392.2-SLLS2 = 6–10 mph over; SLLS3 = 11–14; SLLS4 = 15+. NOT "Stop-Light-Lever".

Manufacturer's max loaded weight for a single vehicle. Threshold of 10,001 lbs triggers most FMCSA rules.

Same as GVWR but for tractor + trailer combos.

Required on most CMVs. ABS malfunction lamps that stay illuminated are commonly cited and frequently OOS depending on the system.

The carrier's scheduled service program. Documented PM is a key piece of FMCSR Part 396 compliance.

Where the actual regs live. FMCSA rules are mostly Title 49 Parts 350–399.

FMCSA's online portal for registering, updating, or biennially renewing a carrier's USDOT/MC info.

State-level system that collects inspection data and feeds it to MCMIS.