NZ Class 4 Licence Theory Test: Requirements and How to Prepare

A Class 4 licence lets you drive heavy rigid vehicles — generally trucks over 18,000kg gross vehicle mass (GVM) — rather than the lighter rigid trucks covered by a Class 2 licence. The learner licence theory test for Class 2 and Class 4 is the same underlying test, drawing on the same Road Code and heavy-vehicle knowledge — so the best way to prepare is to practise that shared knowledge, with extra attention to the handling topics that matter most on a larger rigid vehicle.

What You Need Before Applying for Class 4

Class 4 isn't a licence you can go straight for. You generally need to already hold a full Class 2 licence, and have held it for a minimum period (commonly cited as at least 6 months), before you're eligible to apply for Class 4. Exact current holding periods, age requirements and any course requirements are set by NZTA and can change, so confirm them directly with NZTA or an NZTA-approved driver licensing agent before you plan around them — treat the figures here as a starting point, not a guarantee.

Why the Theory Test Is the Same as Class 2

Class 2 and Class 4 cover the same category of knowledge: operating a rigid heavy vehicle safely and legally. That's why NZTA uses one learner theory test for both — if you've already passed it for Class 2, you don't sit it again for Class 4. The theory test questions are drawn from the same pool covering:

• Vehicle dimensions, weight and load — limits, securing a load, and checks after rough roads.
• Work time and driver records — break rules and logbook requirements.
• Dangerous goods — requirements and endorsements for carrying them.
• Vehicle checks — pre-trip and en-route inspections.
• Handling and stopping — longer stopping distances and how a heavy rigid vehicle handles on slopes and bends.

What actually changes for Class 4 is the vehicle you're licensed to drive and the practical experience and course requirements NZTA sets around it — not the multiple-choice theory content. On top of the shared knowledge, a larger rigid vehicle raises its own handling questions worth knowing well: rollover risk from a higher centre of gravity, bigger blind spots, and how to control speed on a long descent without overheating the brakes. Our Class 4 practice test focuses on exactly that.

How to Prepare

1. If you haven't already, work through the shared Road Code topic tests — most of the test is still general rules.
2. Use our Class 2 heavy vehicle test to cover the heavy-vehicle-specific material, since it's the same knowledge Class 4 draws on.
3. Take our Class 4 test for the large-rigid-vehicle handling questions — rollover risk, blind spots, braking on descents and load checks.
4. Take the heavy vehicle mock exam to practise the full 35-question format under test conditions.
5. Re-read the explanation for every question you miss, and retake the topics where you slip.

Where to Practise

• Heavy Vehicles Class 2 practice test
• Heavy Vehicles Class 4 practice test
• NZ Heavy Vehicle Mock Exam
• All heavy vehicle practice tests

This article is an unofficial study guide. Licensing rules, weight thresholds and experience requirements can change, so confirm the current requirements for your licence with the NZ Transport Agency (NZTA) or an NZTA-approved driver licensing agent before you book.