What is a Level 1 DOT inspection?

A Level 1 DOT inspection is the CVSA North American Standard Inspection, the most thorough of the six roadside inspection levels. It is a 37-step procedure that covers both driver credentials (CDL, medical certificate, hours of service, seatbelt) and the full vehicle (brakes, steering, tires, lighting, suspension, frame, coupling devices, cargo securement, and more). Because it includes the underside of the vehicle, the inspector typically goes under the truck to check brake components, the frame, and the exhaust system.

How long does a Level 1 inspection take?

A Level I inspection usually takes 30 to 60 minutes, depending on the vehicle configuration and how quickly the driver can produce paperwork. A clean, well-organized cab with credentials ready moves faster. If the inspector finds a defect that requires closer measurement, such as brake stroke or tire tread depth, the inspection can run longer.

What is checked in a Level 1 DOT inspection?

The driver side covers CDL and endorsements, medical certificate, hours of service and ELD records, seatbelt use, signs of illness or fatigue, alcohol and drug indicators, and any hazardous materials paperwork. The vehicle side covers brake systems, steering, lighting, tires, wheels and rims, suspension, frame, coupling devices, cargo securement, exhaust, fuel system, windshield and wipers, and, on tankers or hazmat loads, the cargo tank and markings.

What is the difference between a Level 1 and Level 2 inspection?

The main difference is the underside. A Level I inspection includes an under-vehicle examination, so the inspector physically gets beneath the truck to check brakes, suspension, frame, and exhaust. A Level II inspection is a walk-around that only covers items visible without going under the vehicle. Both check the same driver credentials, but Level I is more complete on the mechanical side.

What happens if I fail a Level 1 inspection?

Failing does not mean a fine every time. If the inspector finds a violation that meets the North American Standard Out-of-Service Criteria, the driver or the vehicle is placed out of service until the problem is fixed. Non-critical violations are recorded on the report and feed your CSA score but do not stop the truck. Every inspection, pass or fail, is logged in FMCSA's system and stays visible for 24 months.

Does passing a Level 1 inspection get me a CVSA decal?

Yes. If your vehicle passes a Level I inspection with no out-of-service violations, the inspector may apply a CVSA decal. The decal is valid for up to three months and signals to other inspectors that the vehicle recently passed a full inspection, which encourages them to bypass it and inspect a truck that has not been checked. Decals are color-coded by quarter.

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Level 1 DOT Inspection: Full Walkthrough and OOS Criteria

A step-by-step walkthrough of the CVSA Level I North American Standard Inspection: the 37-step procedure, driver and vehicle items, the most common out-of-service violations, and the CVSA decal.

Small Fleet HQPublished July 2, 20268 min read

DOT inspectionCVSALevel Iout-of-serviceroadside inspectioncomplianceCSA

What a Level 1 DOT inspection is

The Level I North American Standard Inspection is the most thorough roadside inspection in North America. It is a 37-step procedure that examines both the driver and the vehicle, and it is the benchmark all other inspection levels are measured against.¹² Six inspection levels exist under the Commercial Vehicle Safety Alliance (CVSA) system, and Level I is the only one that routinely puts the inspector under your truck to look at brake components, the frame, and the exhaust.

If you run a small fleet or drive as an owner-operator, this is the inspection you most want to be ready for. It is the one that produces the most out-of-service (OOS) orders, and it is the one that carries the most weight when brokers and insurers look at your safety record through FMCSA's CSA score.

Quick Answer A Level 1 DOT inspection is the CVSA North American Standard Inspection, a 37-step check of both driver credentials and the complete vehicle, including the underside. It usually takes 30 to 60 minutes. Pass it with no out-of-service violations and the inspector may apply a CVSA decal valid for up to three months. Any critical violation meeting the North American Standard Out-of-Service Criteria puts the driver, the vehicle, or both out of service until it is fixed.

When and why you get one

You do not schedule a Level I inspection. It happens at a scale house, a fixed inspection station, or during a roadside stop, and the inspector decides the level based on time, staffing, and what they see. A few situations raise your odds of getting a full Level I:

You cross a weigh station during staffing hours and get pulled in.
Something visible prompts a closer look: a light out, a leaking wheel seal, a load that looks poorly secured.
You are traveling during CVSA's International Roadcheck, the annual enforcement blitz that runs roughly 72 hours in mid-May and is heavily Level I.⁵
Your carrier's inspection history flags you for closer attention.

The purpose is safety verification. The inspector confirms the driver is legal to operate and the vehicle is mechanically fit to be on the road.

The driver-side items

The driver portion confirms you are qualified, rested, and fit to drive. These items come straight off the North American Standard Inspection Procedure.²

CDL and endorsements valid for the vehicle and cargo
Medical examiner's certificate (and Skill Performance Evaluation certificate if applicable)
Hours of service, ELD, and record of duty status
Seatbelt use
Signs of sickness or fatigue
Indicators of alcohol or drug use
Hazardous materials and dangerous-goods paperwork, if you are hauling them

Hours-of-service problems are one of the most common driver OOS categories, so a clean ELD record matters as much as a clean truck. For the penalties tied to log problems, see our guide on HOS violations.

The vehicle-side items

The vehicle portion is where Level I separates itself. The inspector checks the full mechanical condition, and because this is Level I, that includes the underside.¹⁶

Brake systems, including adjustment and air brake components
Steering mechanism
Lighting devices and reflectors
Tires
Wheels, rims, and hubs
Suspension
Frame
Coupling devices (fifth wheel, pintle hooks, safety chains)
Cargo securement
Exhaust system
Fuel system
Windshield and wipers
Driveline and driveshaft
On tankers and hazmat loads: the cargo tank and required markings

The 37-step procedure, summarized

The 37 steps are a fixed sequence the inspector follows so nothing gets missed. It is not 37 separate defects to memorize; it is an order of operations that walks from the approach to the final paperwork. In broad strokes:

Phase	What happens
Approach and greeting	Inspector notes the approach, chooses the level, and identifies the driver
Driver credentials	CDL, medical card, records of duty status, hazmat paperwork
Driver condition	Seatbelt, signs of fatigue, alcohol or drug indicators
Vehicle walk-around	Lights, tires, wheels, coupling, cargo securement, fuel and exhaust
Under-vehicle	Brakes and adjustment, suspension, frame, driveline
Brake check	Air loss, pushrod stroke, chamber and hose condition
Documentation	Findings recorded, report reviewed with driver, decal applied if clean

For the item-by-item version you can print and pre-inspect against, see our DOT inspection checklist.

The most common out-of-service violations

A violation only takes you out of service if it meets the North American Standard Out-of-Service Criteria, which CVSA sets and updates each year. The 2026 criteria took effect April 1, 2026.³ Year after year, the same vehicle categories dominate the OOS numbers.

OOS category	Typical triggers
Brake systems	Air loss, cracked or missing brake components, defective linings
Brake adjustment	Pushrod stroke beyond the adjustment limit on enough brakes to meet the 20% defective-brake threshold
Tires	Tread below 2/32 inch on steer tires or 1/32 inch elsewhere, flat tires, exposed cord or belt material
Lights	Required lamps not working, especially at night
Cargo securement	Insufficient tiedowns, damaged securement devices, shifted load
Steering and suspension	Excessive play, cracked or broken components

Brakes, tires, and lights are the big three. If you fix nothing else before your next trip, walk those.

What out-of-service actually means

An OOS order is not a fine by itself. It is an order that the driver cannot drive, or the vehicle cannot move, until the specific violation is corrected. In practice:

If the vehicle is placed OOS, it stays where it is until the defect is repaired, often meaning a mobile mechanic or a tow.
If the driver is placed OOS, for example for an hours-of-service violation, the clock has to run out or the credential problem has to be resolved before driving resumes.
The load sits, the delivery is late, and the costs stack up: repair, downtime, and sometimes a lost customer.

That downtime is why prevention pays. A brake adjustment that costs very little in the shop can cost a day of revenue and a damaged broker relationship on the roadside.

The CVSA decal

Pass a Level I with zero out-of-service violations and the inspector may place a CVSA decal on your vehicle. The decal is valid for up to three months, and it tells other inspectors your truck recently cleared a full inspection.⁴ Inspectors are encouraged to bypass a decaled vehicle and spend their time on trucks that have not been checked, so a valid decal can mean fewer stops for the rest of the quarter.

Decals are color-coded by quarter (green in the first quarter, yellow in the second, orange in the third, and white in the fourth), which is how an inspector reads at a glance whether yours is current. The decal is not a free pass. An obvious defect or a probable-cause reason will still get you inspected, decal or not.

How a Level 1 feeds your CSA score

Every inspection, clean or not, is uploaded to FMCSA's Safety Measurement System (SMS). Violations are weighted by severity and how recently they happened, and they stay on your record for 24 months before aging off.⁸ A pattern of the same violation across several inspections raises the relevant BASIC category and makes you a target for more inspections.

This is where a roadside event becomes a business problem. Many brokers and shippers pull carrier safety data before they tender a load, and a poor inspection history can cost you freight. It also shows up in insurance underwriting, which is one reason inspection performance and premiums move together. See how roadside events connect to the broader safety picture in our truck accident statistics breakdown.

How to prepare

You cannot control when you get pulled in, but you can control what the inspector finds.

Run a real pre-trip every day, and walk the brakes, tires, and lights specifically. These are the three that generate most OOS orders.
Keep credentials current and reachable: CDL, medical card, registration, insurance, and ELD instruction sheet in the cab.
Fix small defects before they become OOS defects. A marginal tire or a soft brake adjustment is cheap in the shop and expensive at the scale.
Know your ELD. Be able to display and transfer your logs without fumbling.
Treat International Roadcheck week as a heightened-risk window and make sure your equipment is tight before mid-May.⁵

For the full picture across all six inspection levels, start with our DOT inspection hub. To understand the walk-around version you are more likely to see, read our guide to the Level 2 DOT inspection. The rules the inspector works from live in 49 CFR Parts 392 and 396.⁶⁷

Frequently Asked Questions

What is a Level 1 DOT inspection?: A Level 1 DOT inspection is the CVSA North American Standard Inspection, the most thorough of the six roadside inspection levels. It is a 37-step procedure that covers both driver credentials (CDL, medical certificate, hours of service, seatbelt) and the full vehicle (brakes, steering, tires, lighting, suspension, frame, coupling devices, cargo securement, and more). Because it includes the underside of the vehicle, the inspector typically goes under the truck to check brake components, the frame, and the exhaust system.
How long does a Level 1 inspection take?: A Level I inspection usually takes 30 to 60 minutes, depending on the vehicle configuration and how quickly the driver can produce paperwork. A clean, well-organized cab with credentials ready moves faster. If the inspector finds a defect that requires closer measurement, such as brake stroke or tire tread depth, the inspection can run longer.
What is checked in a Level 1 DOT inspection?: The driver side covers CDL and endorsements, medical certificate, hours of service and ELD records, seatbelt use, signs of illness or fatigue, alcohol and drug indicators, and any hazardous materials paperwork. The vehicle side covers brake systems, steering, lighting, tires, wheels and rims, suspension, frame, coupling devices, cargo securement, exhaust, fuel system, windshield and wipers, and, on tankers or hazmat loads, the cargo tank and markings.
What is the difference between a Level 1 and Level 2 inspection?: The main difference is the underside. A Level I inspection includes an under-vehicle examination, so the inspector physically gets beneath the truck to check brakes, suspension, frame, and exhaust. A Level II inspection is a walk-around that only covers items visible without going under the vehicle. Both check the same driver credentials, but Level I is more complete on the mechanical side.
What happens if I fail a Level 1 inspection?: Failing does not mean a fine every time. If the inspector finds a violation that meets the North American Standard Out-of-Service Criteria, the driver or the vehicle is placed out of service until the problem is fixed. Non-critical violations are recorded on the report and feed your CSA score but do not stop the truck. Every inspection, pass or fail, is logged in FMCSA's system and stays visible for 24 months.
Does passing a Level 1 inspection get me a CVSA decal?: Yes. If your vehicle passes a Level I inspection with no out-of-service violations, the inspector may apply a CVSA decal. The decal is valid for up to three months and signals to other inspectors that the vehicle recently passed a full inspection, which encourages them to bypass it and inspect a truck that has not been checked. Decals are color-coded by quarter.