CDL Roadside Inspections: What Inspectors Look For

Roadside inspections are a fact of life for every commercial driver. The FMCSA and state enforcement conduct over 3 million inspections per year, and about 20% result in the vehicle or driver being placed out of service. Knowing what inspectors look for — and fixing issues before you hit the road — is the difference between a quick pass and a costly violation. This guide covers every inspection level, what's checked, and how to prepare.

The Six Inspection Levels

The CVSA (Commercial Vehicle Safety Alliance) defines six inspection levels. Not all are equally common, but you should know what each one involves:

Level 1: North American Standard Inspection

The most common and most thorough. Includes a complete driver document check (CDL, medical card, ELD/hours of service, permits, bills of lading) and a full vehicle inspection (brakes, steering, suspension, tires, wheels, rims, lighting, coupling devices, cargo securement, frame, exhaust system, and windshield). The vehicle must be parked, and the driver must exit the cab. Takes 30–60 minutes.

Level 2: Walk-Around Driver/Vehicle Inspection

Similar to Level 1 but the inspector does not go under the vehicle. They check everything visible from ground level — driver paperwork, lights, tires, brakes (external components), coupling, cargo securement. Faster than Level 1 — takes 15–30 minutes.

Level 3: Driver-Only Inspection

Focuses exclusively on driver credentials and paperwork. The inspector checks your CDL, medical certificate, ELD records, hours of service compliance, permits, and drug/alcohol testing records. No vehicle inspection. Takes 10–15 minutes. Often done at weigh stations or agricultural checkpoints.

Level 4: Special Inspection

A targeted inspection focused on a specific item or trend. For example, if FMCSA data shows a spike in brake violations in a region, inspectors may do Level 4 checks focused only on brake systems. These are typically one-time campaigns.

Level 5: Vehicle-Only Inspection

Vehicle inspection without the driver present. Usually conducted at terminals or shipping facilities as part of a compliance review. Covers all vehicle components checked in a Level 1.

Level 6: Transuranic Waste Inspection

Specialized inspection for vehicles transporting radioactive materials. Very rare — only applies to specific Department of Energy shipments.

What Inspectors Actually Check

Driver Side

• CDL: Valid, correct class and endorsements for the vehicle being operated
• Medical card: Current and valid (expired = out of service)
• ELD/logs: Hours of service compliance, no violations, records available for inspection
• Permits: Oversize/overweight, hazmat, fuel tax (IRP/IFTA), state-specific permits
• Drug/alcohol: Clear status in the Clearinghouse, no prohibited status
• Seat belt: Must be worn — not wearing it is a violation
• Cell phone: No evidence of handheld use while driving

Vehicle Side

• Brakes: Adjustment, air pressure, leaks, ABS functionality, pushrod travel
• Tires: Minimum 4/32 inch tread on steering axle, 2/32 inch on other axles; no recap on steering; proper inflation
• Lighting: All required lights working — headlights, taillights, brake lights, turn signals, clearance lights, reflectors
• Coupling: Fifth wheel locking mechanism, kingpin, safety chains (for trailers), no excessive play
• Cargo securement: Cargo properly tied down, no shifting, correct number of tie-downs for weight
• Suspension: No cracked or broken spring leaves, no air bag leaks
• Frame: No cracks, bends, or corrosion in frame rails
• Windshield: No cracks in the driver's line of sight, wipers working
• Exhaust: No leaks under the cab, proper routing, no excessive noise

Top 10 Most Common Violations

1. Brake adjustment out of specification
2. Lighting defects (burned-out bulbs, broken lenses)
3. Tire tread below minimum depth
4. Hours-of-service log violations
5. Expired or missing permits
6. Cargo securement insufficient
7. Air leak in brake system
8. Suspension component damage
9. Windshield obstruction or damage
10. No or expired medical certificate

Most of these are preventable. A 15-minute pre-trip inspection catches brake, lighting, and tire issues before an inspector does. Log your hours correctly and carry current permits. For more on preventing violations, read our pre-trip inspection guide and vehicle maintenance guide.

What Happens If You're Placed Out of Service?

An out-of-service order means you cannot drive the vehicle until the violation is fixed. You must park the vehicle and either repair it on-site or have it towed. Driving an out-of-service vehicle is a separate, serious violation that can result in fines, CDL suspension, and criminal charges. The out-of-service order is recorded in the FMCSA database and affects your CSA (Compliance, Safety, Accountability) scores for two years.

Frequently Asked Questions