A pre-trip inspection is the driver's check of a vehicle before it leaves the yard. It catches mechanical faults, fluid leaks and safety defects before they become roadside breakdowns or, worse, contribute to a collision. The process takes 10 to 15 minutes and is a legal obligation for commercial vehicle operators in most jurisdictions.
This guide covers a systematic pre-trip inspection for light vehicles, trucks and heavy vehicles. Adjust the depth of each check to suit your vehicle type, but do not skip any category entirely.
Before you start
Grab your vehicle pre-start checklist, a pen, a torch and a tyre pressure gauge. For heavy vehicles, also have the previous day's driver vehicle inspection report (DVIR) so you can verify that any reported defects have been addressed.
Park the vehicle on level ground in a well-lit area. Turn the engine off and apply the park brake. If you are inspecting a truck and trailer combination, inspect both units and the coupling.
Step-by-step inspection
1. Exterior walkaround
Start at the driver's door and walk clockwise around the vehicle. Check every item systematically so nothing is missed.
- Lights: headlights, tail lights, brake lights, indicators, clearance markers and reflectors
- Tyres: tread depth, inflation, cuts, bulges and foreign objects (see our tyre tread depth guide)
- Mirrors: clean, secure and correctly adjusted
- Body: new dents, scrapes, cracked glass or missing panels
- Under the vehicle: fresh fluid leaks on the ground
2. Engine compartment
Open the bonnet (or tilt the cab on a truck) and check fluid levels. Compare each to the OEM minimum and maximum marks.
- Engine oil level and condition
- Coolant level (do not open on a hot engine)
- Power steering fluid
- Windscreen washer fluid
- Drive belts for cracks, fraying or glazing
- Hoses for leaks, swelling or soft spots
3. Cabin checks
Sit in the driver's seat. Fasten the seatbelt and adjust mirrors. Start the engine and let it idle. Check all gauges and warning lights on the dashboard. Test the windscreen wipers, washers, heater and demister. Confirm the horn works.
4. Brake test
With the engine running, press the brake pedal firmly. It should feel solid with no spongy travel or drift to the floor. Engage the park brake and try to roll the vehicle gently. For heavy vehicles, check brake pad or lining wear indicators if visible.
5. Air system check (if applicable)
For air-braked vehicles, allow the compressor to build to full system pressure. Check that the low-air warning buzzer or light activates at the correct threshold (typically 55-65 psi). Perform a static leak-down test by holding full pressure with the engine off for two minutes. The drop should not exceed the limit for your vehicle class. Drain moisture from air tanks if fitted with manual drains.
6. Record and sign off
Complete your pre-trip inspection form and sign it. If any defect makes the vehicle unroadworthy (e.g. brake failure, bald tyres, inoperative lights at night), do not drive it. Report the fault and arrange repair before departure.
Common defects and actions
| Defect | Action |
|---|---|
| Blown headlight or tail light | Replace before driving, especially at night |
| Low engine oil | Top up to correct level before departure |
| Tyre below legal tread depth | Replace tyre before driving |
| Spongy or low brake pedal | Do not drive, report for immediate repair |
| Cracked windscreen in driver's line of sight | Assess severity, replace if it impairs vision |
| Air leak exceeding static test limit | Do not drive, locate and repair the leak |
Legal requirements
In Australia, the National Heavy Vehicle Regulator (NHVR) requires heavy vehicle drivers to conduct daily vehicle checks as part of fatigue management and roadworthiness obligations under the Heavy Vehicle National Law. Light vehicle operators also have a general duty under WHS legislation to ensure the vehicle is safe before use.
In the US, FMCSA regulation 49 CFR 396.13 requires commercial motor vehicle drivers to be satisfied the vehicle is in safe operating condition before driving. Drivers must review the previous DVIR and sign off that reported defects have been repaired or do not need repair. Download the light vehicle pre-start checklist for a ready-to-use template.
Pre-trip vs post-trip
| Inspection type | When | Purpose |
|---|---|---|
| Pre-trip | Before departure | Confirm the vehicle is safe and roadworthy |
| Post-trip | At end of shift or on arrival | Record defects for overnight or next-shift repair |
| En-route | During rest stops on long trips | Check tyres, lights, load security and fluid levels |
The pre-trip catches defects before the vehicle moves. The post-trip records defects that developed during the shift so they can be repaired before the next driver takes over. Both are essential for fleet safety.
Going digital with MapTrack
Paper inspection books fill up, get lost in the cab or sit unread in the office. With MapTrack, each vehicle carries a QR code label that drivers scan to open the pre-trip form on their phone. The system captures the timestamp, driver name and GPS location automatically.
Defects flagged during the inspection trigger automated alerts to the fleet manager and can generate a maintenance work order immediately. Fleet-wide inspection compliance is visible in asset tracking dashboards, making audit preparation straightforward.
