Field Journal · Fleet & compliance
DOT Roadside Inspection Checklist: What Inspectors Actually Look For
Kansas City sits at the crossing of I-35 and I-70, which means a lot of trucks and a lot of inspections. This is what each level covers, which defects put units out of service, and what your options are when a truck gets red-tagged on the shoulder.
TL;DR — Quick Answer
What does a DOT roadside inspection cover?
A DOT roadside inspection is a graded check of your truck, trailer, and paperwork. Level I is the full 37-step exam including a brake and under-vehicle inspection; Level II skips the under-vehicle portion; Level III is driver credentials only. Brakes, tires, and lights cause the majority of out-of-service violations.
The inspection levels, briefly
Roadside inspections follow the North American Standard levels set by the Commercial Vehicle Safety Alliance. Three of them account for nearly everything you will encounter:
- Level I — Full inspection. Driver credentials plus a complete vehicle exam, including going under the truck to check brakes, steering, suspension, and frame. This is the one that takes an hour.
- Level II — Walk-around. Same scope minus anything requiring the inspector to get under the vehicle. Faster, and still capable of producing an out-of-service order.
- Level III — Driver only. License, medical card, hours of service, and paperwork. No vehicle component inspection.
Higher levels exist for special equipment, cargo-only checks, and electronic screening, but if you are stopped at a scale or on the shoulder, expect one of the first three.
What gets checked, and what fails
| Area | Inspector checks | Common out-of-service findings |
|---|---|---|
| Brake systems | Pushrod stroke, air loss rate, lining thickness, drum condition, ABS lamp function | Out-of-adjustment slack adjusters, audible air leaks, cracked drums, 20% defective brakes on the unit |
| Tires & wheels | Tread depth, sidewall condition, inflation, lug nut torque, rim cracks | Under 4/32" on steers, sidewall exposure of cord, flat or leaking tire, missing lug nuts |
| Lighting | Headlamps, turn signals, marker lamps, brake lamps, reflective tape | Inoperative required lamps — the single easiest violation to prevent and the most frequently written |
| Coupling & frame | Fifth wheel mounting, kingpin, locking jaws, frame rails, cross members | Excessive fifth wheel play, cracked frame welds, improperly secured mounting bolts |
| Cargo securement | Tiedown count and working load limit, edge protection, blocking and bracing | Insufficient tiedowns for cargo length, damaged straps, unsecured dunnage |
| Driver credentials | CDL class and endorsements, medical card, ELD records, duty status | Expired medical certificate, form and manner log errors, exceeding 11-hour driving limit |
The ranking rarely changes: brakes first, tires second, lights third. All three are catchable in a disciplined pre-trip. A five-minute lamp walk-around prevents the single most-written violation category in the country.
The pre-trip that actually prevents violations
Most drivers do a pre-trip. Fewer do one aimed at what inspectors measure. Add these:
- Mark your pushrods. A paint mark on each pushrod at the adjusted position makes an out-of-stroke chamber visible in one glance instead of requiring a measurement.
- Time your air loss. Build to governor cutout, shut down, and watch the gauge. A leak-down rate outside spec is an out-of-service item and you can hear most of them in a quiet lot.
- Walk the lamps with the four-ways on. Marker lamps and trailer lighting fail constantly and cost nothing to catch.
- Check steer tire depth with a gauge, not a thumb. Steers have a higher minimum than drives and trailers.
- Verify your medical card expiry monthly. An expired card is a paperwork violation that grounds a driver who is otherwise perfectly legal.
You have been placed out of service. Now what?
An out-of-service order means the unit does not move under its own power until the defect is corrected. You cannot nurse it to a shop, and attempting to do so compounds the violation. Realistically you have two paths.
Repair on scene. A large share of out-of-service defects are fixable at roadside — air leaks, slack adjusters, lamps, mud flaps, marker lights, and most tire failures. A mobile unit brings the parts to the truck, the repair is made, and you roll. This is almost always the cheaper outcome and it keeps the load moving.
Tow the unit. Frame cracks, major brake system failures, steering defects, and anything structural means the truck comes in on a wrecker. For a loaded tractor-trailer that is a heavy-duty tow, and depending on the load it may involve moving the freight separately.
Where Titan fits
We run mobile semi and trailer repair and heavy-duty recovery out of Liberty, MO, covering a 50-mile radius across the metro on both sides of the state line. When a unit is red-tagged, call with the violation code and the defect description — that tells us whether to roll a repair truck or a wrecker, and it saves you paying for the wrong one.
Costs for on-scene work are laid out on our mobile semi repair pricing page. If the fault is air-related, our air brake troubleshooting guide covers what to check before you call.
Red-tagged on I-35 or I-70?