The Heavy Vehicle (Heavy Rigid & Heavy Combination) Knowledge Test

Test yourself

The heavy vehicle licence ladder: LR, MR, HR, HC and MC

Australia uses one national set of heavy vehicle licence classes, even though each state and territory issues the licence and runs its own tests. Which class you need depends on the vehicle’s Gross Vehicle Mass (GVM), its number of axles, and whether it tows a trailer. The mass and axle figures below come from the national heavy-vehicle licence classes and are given as a guide to how the ladder works; the exact current thresholds are set under the national licensing standard and applied by each state, so confirm them with your road authority before you plan your pathway.

Light Rigid (LR): a rigid vehicle with a GVM over 4.5 tonnes and up to 8 tonnes, or a vehicle built to seat more than 12 adults (including the driver) up to that mass — a small truck or a light bus.

Medium Rigid (MR): a rigid vehicle with two axles and a GVM over 8 tonnes — a larger single-body truck or bus.

Heavy Rigid (HR): a rigid vehicle with three or more axles and a GVM over 8 tonnes, including articulated (bendy) buses. The rigid classes (LR, MR, HR) also let you tow a trailer up to a set GVM.

Heavy Combination (HC): a prime mover towing a single semi-trailer, or a rigid vehicle towing a heavy trailer — the classic ’semi’. This is your first articulated-truck licence.

Multi Combination (MC): the top class — B-doubles and road trains, where more than one trailer is involved.

You climb this ladder rather than jumping to the top. Most people move from a car (Class C) licence up to LR, MR or HR, then to HC, then MC, because each class generally requires you to have held the one below (or a qualifying class) for a minimum period. Those minimum periods are set by your state or territory and are not the same everywhere, so confirm the current figure with your state road authority.

What the heavy vehicle knowledge test covers

The knowledge test is a computer-based, multiple-choice road-rules exam. It is not the driving test — it is the theory gate you pass first. The exact question count and pass mark vary by state and are set by the road authority, but the subject matter is consistent across the country because heavy vehicles share the same physics and the same national road rules. Expect questions on:

Heavy-vehicle speed limits — many jurisdictions cap heavier vehicles below the posted limit (for example, a lower maximum for trucks and buses over a set mass).

Stopping and following distances — a loaded truck needs far more room to pull up than a car, and the test checks that you understand safe gaps and controlled braking on descents, including correct use of engine or exhaust brakes and gear selection.

Blind spots and low-speed manoeuvring — where large vehicles cannot see, turning wide, and reversing safely.

Mass, dimension and load restraint basics — knowing your limits and that loads must be properly restrained.

Fatigue management — heavy vehicle drivers work under fatigue laws covering work and rest hours. Most states apply the Heavy Vehicle National Law through the National Heavy Vehicle Regulator (NHVR); Western Australia and the Northern Territory run their own heavy-vehicle laws. The test expects awareness of these rules.

Vehicle safety and roadworthiness — pre-trip checks, coupling and uncoupling, and defect reporting.

Rules for bridges, level crossings, tunnels and steep grades.

Because these topics are safety-critical, the test is written to make sure you genuinely understand the reasoning, not just memorise an answer letter.

Who needs to sit it, and what you need first

You need the heavy vehicle knowledge test if you want to drive — or upgrade to drive — a vehicle above the light-rigid threshold: truck drivers, bus and coach drivers, plant and equipment operators, logistics and delivery drivers, and tradespeople whose vehicles sit above the light-rigid threshold (confirm the exact mass figure with your authority).

Before you can sit it, states generally require that you already hold a current Australian car (Class C) or higher licence and have held it for a minimum qualifying period; meet the class-progression rule (for HC and MC especially, you usually must have held a lower heavy class first); meet the medical and eyesight standards for commercial driving; and pay the applicable test and licence fees.

Every one of those specifics — the minimum holding periods, the medical standard details, and the fees — is set by your state or territory and changes over time. Do not rely on a number you read on a forum or in an old guide; confirm the current requirements with your state road authority before you plan your pathway.

How it works in your state

Licensing is state-run, so the booking process and even the name of the test differ:

NSW (Transport for NSW): sit the heavy vehicle knowledge test at a service centre, then complete a competency-based assessment or a driving test.

VIC (VicRoads / Department of Transport and Planning): a knowledge test plus a practical drive assessment.

QLD (Transport and Main Roads): a written road-rules test may be required before the practical assessment.

WA (Department of Transport): heavy vehicle assessment through DoT-approved processes.

SA (DIT / Service SA): theory test, then practical assessment.

TAS (Transport Tasmania): knowledge test, then assessment.

ACT (Access Canberra) and NT (Motor Vehicle Registry): their own booking and testing steps.

The principle is the same everywhere — theory first, then a practical assessment — but the detail is not. Always start on your own authority’s website, and if you live near a border, check the rules for the state that will issue your licence, not the one next door.

How to prepare and pass

Treat the theory test as the part you should not fail. The most reliable preparation is:

1. Read your state’s heavy vehicle handbook or driver’s guide end to end — it is the source the questions are drawn from.

2. Practise with realistic multiple-choice questions until you are consistently scoring well above the pass mark, not just scraping over it.

3. Focus on the heavy-vehicle-specific material — speed limits, braking, fatigue rules and load basics — because that is what separates this test from the car test you already passed.

4. Learn the reasoning, not the answer letter. On the road, understanding why a rule exists is what keeps you and everyone around you safe.

After you pass the knowledge test you still have the practical stage — a competency-based assessment or a drive test, depending on your state — so a solid theory foundation makes the on-road learning far easier. Free practice questions are the fastest way to find and fix your weak spots before test day.

Last verified 4 September 2026 against the Australian Road Rules and your state road authority. Rules, fees and figures change. Always confirm current details with your state road authority before you rely on them.