Class 3 Theory Test key terms

A New Zealand driver licence that lets you drive heavy motor vehicles with a gross laden weight over 6000 kg but not exceeding 18000 kg, plus any vehicle a Class 1 or 2 licence covers.

A licence covering heavy vehicles with a gross laden weight over 6000 kg but not over 18000 kg that are rigid, plus light vehicles and light combinations. It is the usual prerequisite step before a Class 3 licence.

A licence for heavy vehicles with a gross laden weight over 18000 kg, including heavy rigid vehicles. Class 3 holders can progress to it after meeting experience and test requirements.

The licence class for heavy combination vehicles, such as truck and trailer units, where the combination exceeds 18000 kg gross laden weight. It sits above Class 4 in the heavy vehicle progression.

A motor vehicle with a gross laden weight exceeding 6000 kg. The threshold determines whether a heavy vehicle licence class, stronger brakes, and heavier inspection obligations apply.

The total weight of a vehicle plus its load at any time, as specified by the manufacturer or set by regulation. It decides which licence class and which weight-based fees or charges apply.

The maximum permitted weight of the vehicle itself, including chassis, body, fluids and accessories, without payload. It is a design limit used alongside gross laden weight when checking legal loading.

The unladen weight of a vehicle with fuel and standard equipment but no load or passengers. Operators use it to work out payload and to check axle loads against limits.

The weight a vehicle can legally carry, found by subtracting tare weight from gross vehicle weight. Overloading beyond payload can breach weight limits and invalidate licence conditions.

A heavy vehicle whose cab, chassis and load body form one unit that cannot articulate in the middle. Rigid trucks over 6000 kg are the core of what a Class 3 licence allows.

A heavy vehicle made of a rigid truck towing one or more trailers, articulating at the coupling. These combinations generally require a Class 5 licence when over 18000 kg.

A trailer with its own axle set connected to the towing vehicle by a drawbar, so it can steer independently. Towing one changes the vehicle combination class and braking requirements.

A trailer whose front is supported by the towing tractor unit through a fifth wheel coupling rather than its own axle. It forms an articulated combination with different licence and inspection rules.

The horseshoe-shaped coupling mounted on a tractor unit that grips the kingpin of a semi-trailer. It must be inspected for wear, secure locking and correct lubrication.

The vertical pin under the front of a semi-trailer that locks into the fifth wheel. Wear or cracking around the kingpin is a serious safety defect found in pre-trip checks.

The mechanical connection between a towing vehicle and a drawbar trailer, including the hitch and safety chain points. It must be rated for the load and checked for wear and secure latching.

A secondary connection between a towing vehicle and trailer that keeps them attached if the main coupling fails. Chains must be correctly rated, crossed where required, and free of damage.

The load carried by a single axle or axle set, measured at the ground. Exceeding axle limits is an offence even if total gross weight is legal, and it affects road wear and stability.

Two or more axles grouped closely together that share load, such as a tandem or tri-axle group. Regulations set separate weight limits for axle sets to protect roads and bridges.

How a vehicle's total weight is spread across its axles and tyres. Poor distribution can overload one axle, reduce steering grip and braking performance, and breach legal limits.

The system of straps, chains, curtains or racks that stops a load moving or falling off during travel. It must meet a recognised standard and be checked before every trip.

A strap, chain or rope used to tie down cargo to a vehicle. Lashings need correct rating, tension and attachment points, and must be inspected for fraying or wear.

The periodic inspection certificate required for heavy vehicles, confirming they meet safety and mechanical standards. It must be current before the vehicle is used on the road.

A certificate issued after a vehicle passes an approved inspection, often used for light vehicles or specific checks. Heavy vehicles normally require a certificate of fitness instead.

An approved business authorised to carry out certificate of fitness inspections and issue certificates for heavy vehicles. Inspectors must be qualified and follow published standards.

A structured check of a vehicle's brakes, steering, tyres, lights, structure and couplings against safety standards. Heavy vehicles face more frequent and more detailed inspections than light cars.

The driver's walk-around check before driving, covering tyres, lights, brakes, couplings, load security and fluid leaks. It catches defects early and is a legal duty for heavy vehicle drivers.

A routine driver inspection performed each day a heavy vehicle is used, recorded in a log or checklist. It supports the certificate of fitness system by finding faults between formal inspections.

A formal notice issued when a vehicle fails inspection or is found unsafe, requiring repair and re-inspection. Driving a vehicle with an active defect notice can lead to fines and licence action.

Written documentation of repairs, servicing and inspections for a heavy vehicle. It shows a operator's safety responsibilities and helps track recurring faults and inspection dates.

A check of braking performance, such as a roller brake test or deceleration test, required for heavy vehicle certification. It confirms the service and parking brakes meet legal efficiency standards.

A braking system powered by compressed air, common on heavy vehicles. Drivers must check air pressure build-up, leaks and low-pressure warnings during daily checks.

A distance-based charge paid by owners of diesel and heavy vehicles in New Zealand instead of fuel excise tax. Heavy vehicles pay according to weight and axle configuration.

A prepaid licence for a set distance that a vehicle may travel under the road user charges system. Travelling beyond the purchased distance without buying more is an offence.

The label displayed on the vehicle showing the road user charges licence details, including distance purchased and expiry. It must be carried and shown correctly for enforcement checks.

The odometer or hubometer used to measure distance travelled for road user charges. It must be accurate and working, and tampering with it is a serious offence.

A mechanical distance meter fitted to a wheel hub, often used on heavy vehicles for road user charges. It records distance travelled and must match the licensed distance purchased.

The person or business responsible for operating a heavy vehicle, including its maintenance, inspections and road user charges. Operators share legal duties with drivers for vehicle safety.