What Are the Top 10 Out-of-Service (OOS) Violations for Roadside Inspections?

Question

Accepted Answer

1. What is an Out-of-Service (OOS) violation?
An OOS violation is a safety-related infraction identified during a roadside inspection that is severe enough to prohibit the driver or vehicle from continuing operation until corrected. These are enforced by the Federal Motor Carrier Safety Administration.

2. Why are OOS violations important?
OOS violations directly impact safety, CSA scores, and insurance risk. Multiple OOS violations can lead to fines, audits, or even suspension of operating authority.

3. What are the most common OOS violations?
Here are the top 10 OOS violations based on FMCSA data:
Brakes out of adjustment or inoperative – Inadequate braking can lead to accidents.
Steering mechanism defects – Loose or damaged steering components are extremely hazardous.
Tires and wheels in poor condition – Worn, bald, or improperly inflated tires can cause blowouts.
Lighting and signaling violations – Non-working headlights, brake lights, or turn signals affect visibility and communication.
Driver Hours of Service (HOS) violations – Driving beyond allowed limits increases fatigue-related crash risk.
Driver not medically certified – Missing or expired medical examiner’s certificate makes a driver OOS.
Cargo securement violations – Improperly loaded or unsecured cargo can shift or fall, creating hazards.
Brake hose or tubing leaks – Fluid leaks compromise braking ability.
Suspension system defects – Worn or broken suspension components affect vehicle stability.
Excessive vehicle weight or overweight axles – Overloaded trucks increase stopping distance and road damage.

4. How do OOS violations affect CSA scores?
Each OOS violation contributes to your CSA “Vehicle Maintenance” or “Unsafe Driving” scores, which are monitored by the FMCSA. High scores increase audit frequency and insurance risk.

5. Can OOS violations affect my insurance premiums?
Yes. Frequent or severe OOS violations signal higher risk to insurers, which can lead to higher premiums or reduced coverage options.

6. How can I prevent OOS violations?
Perform daily pre-trip inspections
Maintain and service vehicles regularly
Ensure drivers are trained on cargo securement and HOS rules
Keep accurate driver qualification files and medical certificates up to date

7. Are all OOS violations equally serious?
No. Some, like brake or steering failures, are considered critical and carry immediate risk, while others may be less severe but still prevent operation until corrected.

8. How are OOS violations documented?
OOS violations are recorded on the inspection report, and copies are sent to the FMCSA. Repeat or severe violations are tracked in the Safety Measurement System (SMS).

9. How long does an OOS order last?
The vehicle or driver must remain out of service until the specific violation is corrected and verified. Some repairs may be done roadside, while others require maintenance at a facility.

10. Can addressing OOS violations improve safety ratings and insurance costs?
Absolutely. Correcting OOS violations promptly demonstrates compliance, reduces CSA scores, and can lead to lower insurance premiums over time.