Out-of-Service Violations in Trucking: What Puts You on the Side of the Road

Two Types of OOS Orders

Driver Out-of-Service: The individual driver is prohibited from operating a CMV. The truck can be moved by a qualified replacement driver if one is available, but the cited driver cannot touch the wheel.

Vehicle Out-of-Service: The specific vehicle is prohibited from being operated until the defect is corrected and documented. A different driver cannot drive around the OOS order — the truck stays put until it's fixed.

Both types can be issued at the same time during the same inspection.

CVSA OOS Criteria: The Standard

The Commercial Vehicle Safety Alliance (CVSA) publishes the North American Standard Out-of-Service Criteria — the specific defects and conditions that must result in an OOS order. FMCSA has adopted the CVSA OOS criteria as the national standard under 49 CFR § 396.9.

Driver OOS Triggers

Hours of Service violations:

Exceeding the 11-hour driving limit
Exceeding the 14-hour on-duty limit
Exceeding the 60/70-hour weekly limit
False logs — discrepancy between ELD data and actual records
Operating without an ELD when required

For a full breakdown of HOS violations, see HOS violations that get truckers shut down.

Medical and license issues:

Expired or missing medical examiner's certificate
CDL expired
CDL suspended, revoked, or downgraded
Medical variance not on file

Drug and alcohol:

Positive roadside drug or alcohol test
Any alcohol use within 4 hours of operating a CMV
Alcohol level of 0.04 BAC or higher
Smell or visible indicators of drug or alcohol use

Other driver violations:

No seatbelt while operating CMV
Using a handheld mobile device while driving

Vehicle OOS Triggers

Brakes (most common OOS condition):

Brake adjustment out of limits — measured by push rod stroke
Brake lining worn below minimum thickness
Cracked or broken brake drum
Air leaks — audible air leak at any brake component
Inoperative brakes on an axle
Low air pressure warning system not working

Tires:

Steering axle tire tread depth below 4/32"
Other axle tire tread depth below 2/32"
Flat tire or tire that's obviously underinflated
Tire with exposed cord or wire
Tire with a visible bump or knot (bulge)

Steering and coupling devices:

Steering wheel free play exceeds limits
Tie rod or drag link with loose joints
Fifth wheel jaws not fully locked
Safety chains or cables missing or broken

Lighting, fuel system, cargo, suspension:

No functioning headlights or taillights/brake lights
Fuel leaking from the tank or fuel lines
Cargo not secured per 49 CFR Part 393
Broken or missing spring hangers

How Long Are You Off the Road?

Driver OOS: You cannot operate until the condition is corrected. For HOS violations, this typically means waiting out the required off-duty time. For medical or license issues, the document must be updated or replaced.

Vehicle OOS: The vehicle cannot move until the defect is documented as repaired. There is no fixed time limit — you're off the road until the condition is corrected, full stop.

Operating Under an OOS Order

Under FMCSA regulations and 49 CFR § 396.9(c), operating a CMV under an OOS order can result in:

Civil penalties up to the willful violation tier
Criminal referral for egregious cases
Potential suspension or revocation of operating authority
Dramatically elevated risk during any future compliance review

If you're placed OOS, you're done for the day. The cost of an OOS violation — in CSA points, insurance rates, and potential fines — far exceeds the cost of the delay. See DOT fines and penalties for the penalty ranges.

How OOS Orders Affect Your Safety Rating

OOS violations affect your CSA scores in specific BASICs:

Vehicle Maintenance BASIC — vehicle OOS conditions
HOS Compliance BASIC — driver OOS for HOS violations
Driver Fitness BASIC — driver OOS for CDL/medical issues
Unsafe Driving BASIC — driver OOS for seatbelt, phone use

OOS violations carry higher severity weights in the SMS calculation than non-OOS violations. See CSA Scores Explained for how OOS violations affect your BASIC percentile scores.

Frequently Asked Questions

Can I have a replacement driver move my OOS vehicle?

Only if the vehicle OOS order has been cleared — meaning the defect has been repaired and documented. The OOS order is on the vehicle, not just the driver.

What do I do if I believe an OOS order was issued in error?

Accept the order at the roadside — do not argue with the officer. After the fact, file a DataQ challenge at dataqs.fmcsa.dot.gov to dispute the violation if you believe it was incorrectly applied.

Does an OOS violation affect future freight bookings?

Yes, indirectly. Brokers and shippers can see your CSA scores and safety rating. A pattern of OOS violations raises flags about equipment reliability. Some shippers will not tender freight to carriers with high Vehicle Maintenance BASIC scores.

How do brake adjustments get out of specification so quickly?

Brake adjustment changes with use, heat cycling, and wear. Brakes that were properly adjusted at the last pre-trip can fall out of adjustment during the day's driving. This is why CVSA brake violations are so common — brakes require ongoing attention, not just an annual check.