A pre-trip inspection finds what roadside inspectors find
Brakes, tires, and lights cause most of the out-of-service orders written at roadside, and a driver can spot many of those defects in the yard. Here is what the rules require before you drive, what to look for, and what to do when something is wrong.
Written by Rigo Diaz
The pre-trip in numbers
A pre-trip inspection is the check a driver makes before driving a commercial motor vehicle. Federal rules require you to be satisfied that 11 items work, from brakes and steering to tires, lights, and coupling devices, that emergency equipment and cargo are secure, and that you have reviewed and signed the last inspection report if it listed defects.
Most of the vehicle defects that take a truck off the road at a roadside inspection are things a driver could have seen in the yard: a worn tire, a dead lamp, a chafed air line, a loose strap. When an inspector finds them instead, they are scored against your company for two years.
I spent more than six years in risk management before I founded Simplex, and I have led it for more than 25 years since. This guide covers what a pre-trip inspection must include, a walk-around that covers it, and what happens when you find something wrong. Studying for the CDL skills test instead? Our Texas CDL pre-trip inspection guide covers the test version.
The full briefing, read aloud
8 chapters. Select one to jump to it.
Generated with AI text-to-speech from this article's key insights, in order, rather than reading it word for word. Chapter times come from a transcript of the audio. The article itself was written and reviewed by Rigo Diaz.
Key takeaways
The rule names 11 items
Under 49 CFR 392.7, you may not drive until you are satisfied the brakes, steering, lights, tires, horn, wipers, mirrors, coupling devices, wheels, and emergency equipment work.
Read the last report first
If the previous driver vehicle inspection report listed defects, review it and sign it before you drive (49 CFR 396.13).
No federal pre-trip form
The rule requires you to be satisfied, not to fill out a form. The written report comes at the end of the day, and only when a defect is found.
A defect keeps the truck parked
A vehicle likely to cause a crash or breakdown may not be operated. The carrier repairs it, or certifies that repair is unnecessary, first.
Hazmat and cargo add checks
Placarded loads need a tire check at the start of each trip and each time you park. Cargo is rechecked within the first 50 miles.
A skipped pre-trip is scored
A 392.7 citation carries a severity weight of 4 in the Vehicle Maintenance BASIC, and it counts for up to 24 months.
In this articleContents
What does FMCSA require in a pre-trip inspection?
FMCSA requires the driver to be satisfied, before driving, that the vehicle is in safe operating condition. Four rules define what that covers:
- 49 CFR 392.7(a): service brakes and trailer brake connections, parking brake, steering mechanism, lighting devices and reflectors, tires, horn, windshield wipers, rear-vision mirrors, coupling devices, wheels and rims, and emergency equipment must be in good working order.
- 49 CFR 392.8: the emergency equipment required by 393.95, a fire extinguisher and warning devices, must be in place and ready for use. Our fire extinguisher guide covers the ratings.
- 49 CFR 392.9: cargo is distributed and secured; doors, tarps, the spare tire, and other equipment are fastened; and nothing blocks your view or your exit from the cab.
- 49 CFR 396.13: you review the last driver vehicle inspection report if it listed defects, and sign it to acknowledge that the repairs were certified.
Who is responsible for the pre-trip inspection?
The driver does it, and the carrier must require it. Under 49 CFR 390.11, every duty the regulations place on a driver is also the carrier's duty to enforce. An owner-operator running under their own authority holds both.
Drivers picking up intermodal equipment, such as a container chassis, have a parallel list in 392.7(b): visible brake components, lights and conspicuity marking, wheels and tires, air lines, the king pin, rails, tie-down bolsters, locking pins, and sliders.
How to do a pre-trip inspection, step by step
No federal rule sets an order. A fixed route around the truck, the same every day, is what makes sure every item gets seen. This one covers the rules above.
Step 1: Start with the last report
Read the last inspection report for this tractor and trailer. If it lists defects, confirm the carrier certified each one as repaired or not needing repair, then sign it. Check the cab documents while you are there; our permit book guide lists what rides in the truck.
Step 2: Look under and around the truck
Before opening anything, look at the ground for fresh oil, coolant, or fuel, and at the truck for a lean that points to a suspension or tire problem.
Step 3: Check the engine compartment
Check oil and coolant levels, belts, and hoses, and look for wiring rubbed through, loose mounts, and leaks.
Step 4: Steering, wheels, and tires
Look for loose or missing lug nuts, cracked rims, leaking hub seals, and damaged steering parts. Under 49 CFR 393.75, no tire may have exposed ply or belt, tread or sidewall separation, a flat, or an audible leak, and tires must be inflated for the load. Tread must be at least 4/32 inch on steer tires and 2/32 inch on the rest, measured in a major groove.
Step 5: Brakes and air lines
Look at brake chambers, hoses, and slack adjusters for damage, chafing, and audible air leaks. The air and electrical lines between tractor and trailer should be connected, supported, and clear of the deck. Pushrod stroke is measured, not eyeballed; our brake inspection checklist covers what inspectors measure.
Step 6: Coupling, lights, and cargo
Confirm the fifth wheel jaws are locked on the kingpin, the release handle is in place, and the landing gear is up. Turn on every lamp, including turn signals, brake lamps, and clearance lamps, and check reflectors and conspicuity tape. Then check the load, doors, tarps, and straps.
Step 7: Finish in the cab
Test the horn, wipers, mirrors, and gauges, confirm the low-air warning works, and check that the parking and service brakes hold before you move. Confirm the fire extinguisher is charged and mounted and the warning triangles are aboard.
Which defects take trucks out of service most often?
Brakes, tires, and lights. In CVSA's 2026 International Roadcheck, a three-day inspection event, five categories led the U.S. vehicle out-of-service violations:
| Violation | U.S. OOS violations | Share |
|---|---|---|
| Brake systems | 2,816 | 23.6% |
| Tires | 2,669 | 22.3% |
| 20% defective brakes | 1,846 | 15.4% |
| Lights | 1,514 | 12.7% |
| Cargo securement | 1,438 | 12.0% |
Flat or worn tires, dead lamps, air leaks, and loose straps are all visible on a walk-around. Brake adjustment is the exception: it takes a measurement, so it belongs in your maintenance checklist as well as the driver's routine. Inspectors work a longer list in a full roadside check; our Level 1 inspection guide walks through it.
What happens if you find a defect during a pre-trip inspection?
You don't drive until it is fixed, or until the carrier certifies that repair is unnecessary. Under 49 CFR 396.7, a vehicle may not be operated in a condition likely to cause a crash or a breakdown.
- Tell your carrier or maintenance contact right away. Don't wait for the end-of-day report.
- The carrier repairs any defect likely to affect safety before the truck runs again, and certifies the repair, or that none was needed (396.11(a)(3)).
- List the defect on that day's driver vehicle inspection report, so the record shows it was found and fixed.
A defect that shows up on the highway is different: 396.7(b) lets you continue only to the nearest place where repairs can safely be made, and only if that is less hazardous to the public than leaving the truck where it is.
Pre-trip vs post-trip inspection: how do they connect?
The post-trip produces the written report, and the next pre-trip reads it. Under 49 CFR 396.11, at the end of each day's work you prepare a driver vehicle inspection report for each vehicle you drove, covering the same 11 items, but only when a defect was found or reported to you.
- The report identifies the vehicle, lists the defects, and is signed by the driver. On team runs, one signature is enough if both drivers agree on the defects.
- The carrier certifies the repair, and the next driver signs to acknowledge the review.
- The carrier keeps the report, the repair certification, and the driver's review for 3 months.
- Reports can be electronic. FMCSA made that explicit in a rule effective March 23, 2026.
A carrier operating only one commercial motor vehicle is exempt from the report rule, though not from the pre-trip itself. Our maintenance file guide covers where these reports sit in the carrier's records.
How long does a pre-trip inspection take?
No federal rule sets a minimum time. It takes as long as checking every item takes on that truck and trailer. 49 CFR 395.2 counts all time inspecting a commercial motor vehicle as on-duty time, so log it as on duty, not driving.
Extra checks for hazmat and cargo
When a load must be marked or placarded, 49 CFR 397.17 requires you to examine each tire at the beginning of each trip and each time the vehicle is parked. A flat, leaking, or underinflated tire is fixed before you drive, except to reach the nearest safe place. An overheated tire is removed and placed a safe distance from the vehicle, which stays parked until the cause is corrected.
For any load on a truck or tractor, 392.9 adds checks after you leave: inspect the cargo and its securement within the first 50 miles, then at each change of duty status, or after 3 hours or 150 miles of driving, whichever comes first. Sealed loads you are ordered not to open, and loads that cannot practically be inspected, are exempt.
How does a skipped pre-trip show up on your safety record?
As roadside violations scored against the carrier. FMCSA's Safety Measurement System places these citations in the Vehicle Maintenance BASIC, per its violation list (Appendix A, version 3.21):
| Citation | As written on the report | Severity weight |
|---|---|---|
| 392.7(a) | Driver failing to conduct pre-trip inspection | 4 |
| 396.13(c) | No reviewing driver signature on DVIR | 4 |
| 396.11 | No or inadequate driver vehicle inspection report | 4 |
| 392.8 | Failing to inspect/use emergency equipment | 2 |
Weights run from 1 to 10, recent violations count more, and nothing older than 24 months is used, according to FMCSA's SMS methodology. Each defect the inspector finds is cited and weighted on its own, on top of any pre-trip citation. A hazmat tire check skipped under 397.17 is scored in the Hazardous Materials Compliance BASIC.
In a compliance investigation, operating a truck before fixing out-of-service defects a driver listed on the report is an acute violation, the class that requires immediate corrective action. Our guide to CSA scores and truck insurance covers what that record means at renewal.
How Simplex helps you keep inspections off your record
The driver's walk-around is the first step. The reports, repairs, and roadside results behind it need an owner too.
Records an auditor checks
Our DOT safety compliance team sets up and maintains the programs FMCSA samples, including documented vehicle maintenance, and watches your safety record.
CSA monitoring
Our compliance programs include CSA monitoring, annual inspection tracking, preventive maintenance records, and a DOT mock audit.
What insurance won't fix
Physical damage coverage generally excludes wear and tear and mechanical breakdown. Our physical damage page explains what a policy does and does not pay for.
Frequently asked questions
What is a pre-trip inspection?+
Who is responsible for conducting the pre-trip inspection?+
How long does a pre-trip inspection take?+
When should a hazmat driver perform a pre-trip inspection?+
If you find a defect during a pre-trip inspection, what needs to happen?+
Do drivers have to fill out a pre-trip inspection form?+
Where this information comes from
The requirements below come from federal regulation, FMCSA's Safety Measurement System, and CVSA's published results, checked on October 19, 2026.
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1
eCFR — 49 CFR 392.7
The 11 parts and accessories a driver must be satisfied are in good working order; intermodal equipment list.
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2
eCFR — 49 CFR 396.13
Before driving: be satisfied the vehicle is safe, review and sign the last inspection report.
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3
eCFR — 49 CFR 396.11
End-of-day report content, carrier repair and certification, 3-month retention, exceptions, electronic reports.
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4
eCFR — 49 CFR 392.9
Cargo securement checks before the trip, within 50 miles, and every 3 hours or 150 miles.
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5
eCFR — 49 CFR 397.17
Tire checks for marked or placarded hazmat vehicles at each trip start and each stop.
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6
eCFR — 49 CFR 393.75
Tire conditions that bar operation and minimum tread depths.
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7
CVSA — 2026 International Roadcheck Results
Top U.S. vehicle out-of-service violations, released August 25, 2026.
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8
FMCSA — SMS Methodology Appendix A, v3.21
BASIC and severity weight for pre-trip, DVIR, and emergency equipment citations.
Written by
Rigo Diaz
Founder & CEO, Simplex Group
Founder and CEO of Simplex Group, with more than 25 years leading the company and helping trucking entrepreneurs navigate compliance, insurance, and the day-to-day demands of running a carrier. Before founding Simplex, he spent more than six years in risk management, experience that continues to shape how he approaches insurance, compliance, and carrier risk today.
Published · Updated
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