Reading an Inspection Report: Levels 1–6
Not every roadside inspection is the same. FMCSA defines a standardized set of inspection levels, each covering a different scope — from a comprehensive driver-and-vehicle check down to narrow, specialized inspections. Knowing which level applies to a given inspection record changes how much weight it should carry when reading a carrier's history.
Level I — North American Standard Inspection
This is the most thorough level, covering both driver and vehicle. It includes a review of driver credentials (license, medical certification, hours-of-service records) and a comprehensive check of vehicle mechanical systems — brakes, steering, lighting, tires, coupling devices, and more. A Level I inspection is the one most likely to result in an out-of-service order, simply because it examines the most.
Level II — Walk-Around Driver/Vehicle Inspection
Similar in scope to a Level I but without the items that require physically getting under the vehicle. It still covers driver credentials and a substantial visual and walk-around check of the vehicle's condition, just without the most invasive mechanical checks.
Level III — Driver-Only Inspection
Focused entirely on the driver — license, medical certification, hours-of-service compliance, and related paperwork — without a vehicle mechanical check. A violation found during a Level III inspection is a driver-side issue by definition, not a vehicle maintenance one.
Level IV — Special Inspections
A one-time examination usually done to investigate a specific trend or study a particular item, rather than a routine comprehensive check. These are less common than Levels I-III in everyday enforcement.
Level V — Vehicle-Only Inspection
The mechanical counterpart to a Level III — a full vehicle inspection performed without the driver present, often conducted at a carrier's facility rather than roadside. A violation here is a vehicle maintenance issue, independent of any driver-related findings.
Level VI — Enhanced NAS Inspection for Radioactive Shipments
A specialized, more rigorous inspection level required specifically for shipments of certain radioactive materials, combining a full Level I inspection with additional radiological requirements. This level applies to a very small subset of carriers given how narrow its scope is.
Why the level matters when reading a carrier's inspection history
A carrier's overall inspection count mixes all of these levels together, but the level determines what was actually checked. A string of Level III (driver-only) inspections with no violations doesn't tell you anything about the vehicles' mechanical condition, because the vehicles weren't part of those inspections. Similarly, distinguishing driver-related from vehicle-related out-of-service orders — see What an Out-of-Service Rate Says About a Carrier — only makes full sense once you know which inspection levels contributed to each count.
How this connects to the BASICs
Violations found across these inspection levels feed into FMCSA's five BASIC categories — see What the Five FMCSA BASICs Actually Measure for how driver-focused and vehicle-focused violations map to those categories, and Vehicle Maintenance Violations That Most Often Ground a Truck for the specific defects that show up most in vehicle-level inspections.
Checking a carrier's inspection history
A full carrier profile, available through DOT Number Lookup, shows inspection and out-of-service counts for both drivers and vehicles over the trailing 24 months.