Published by Interstate Fleet Services · Rock Hill, SC
A roadside DOT inspection can happen anywhere, anytime — at a weigh station on I-77, at a port of entry, or on any road where a DOT enforcement officer spots your truck. When an officer flags your vehicle for an inspection, they work through a systematic checklist of safety-critical items. Find enough violations, and your truck gets placed out of service on the spot.
Understanding what inspectors look for — and what gets trucks placed out of service — is the foundation of a compliance program that keeps your fleet moving.
FMCSA defines six levels of roadside inspection. The most common are:
The most thorough inspection — covers driver qualifications, hours of service, and a full vehicle inspection. Requires the driver to exit and the inspector to go under the vehicle.
Covers everything a Level I does except the under-vehicle inspection. Very common during targeted enforcement campaigns.
Focuses on driver credentials, hours of service, and driver fitness. Does not include a vehicle inspection.
Typically a single-element inspection — for example, checking cargo securement or a specific equipment concern.
Inspector Looks For:
What You Should Know:
Brake violations are the number one reason trucks get placed out of service during roadside inspections. Brake adjustment is a particularly common finding — and it's a moving target because brakes adjust throughout the day as they heat and cool. Regular brake inspections and adjustments as part of your maintenance program are non-negotiable.
Inspector Looks For:
What You Should Know:
Tire violations are highly visible to inspectors — they walk around the truck and trailer looking at every tire. Tread depth violations and sidewall damage are found frequently. Regular tire pressure checks and tread depth monitoring should be part of your pre-trip inspection routine.
Inspector Looks For:
What You Should Know:
Lighting violations are among the easiest for inspectors to spot and among the easiest for operators to prevent. A thorough pre-trip inspection that actually walks around the truck and tests all lights catches these issues before an inspector does. We find lighting problems regularly during our DOT inspection service.
Inspector Looks For:
What You Should Know:
Steering violations are less common than brake or lighting violations, but they're treated as safety-critical and result in immediate out-of-service orders when found. Steering components need to be inspected as part of regular maintenance.
Inspector Looks For:
What You Should Know:
Coupling violations are rare but serious. A failed coupling between tractor and trailer at highway speed is catastrophic. Fifth wheel inspection and kingpin measurement should be part of regular trailer inspections.
Inspector Looks For:
What You Should Know:
Cargo securement violations are primarily a flatbed and open trailer concern. FMCSA has specific requirements for the number, type, and rating of securement devices based on cargo weight and type. Know the requirements for your load type.
Every violation found during a roadside inspection is recorded in the Federal Motor Carrier Safety Administration's (FMCSA) SAFER system and affects your Compliance, Safety, Accountability (CSA) score. A poor CSA score increases the probability of future inspections, can trigger focused investigations, and can affect your ability to secure contracts with shippers who require carrier safety ratings.
The math is simple: violations accumulate points, points accumulate in your BASIC (Behavior Analysis and Safety Improvement Category) scores, and high BASIC scores attract enforcement attention. Keeping your trucks in proper mechanical condition through regular inspection and maintenance is the most effective CSA management strategy available.
Federal regulations require commercial truck drivers to conduct a pre-trip inspection before each trip and document it. Many drivers treat this as a paperwork formality — but done properly, a pre-trip inspection is the most effective tool you have for catching problems before an inspector does.
A thorough pre-trip takes 20–30 minutes and should cover: all lights tested (brake lights, turn signals, marker lights), all tires checked visually and for pressure, brake function tested, fluid levels checked, coupling and fifth wheel confirmed, and cab equipment verified. For owner-operators and fleet managers, building pre-trip inspection compliance into your routine is the cheapest maintenance you can do.
We find the issues and fix them in one visit. Call to schedule.
(803) 329-9755