NSW Heavy Vehicle Knowledge Test key terms

In NSW, a motor vehicle with a gross vehicle mass over 4.5 tonnes, or a combination such as a truck towing a trailer. Different licence classes and rules apply compared with light vehicles.

The maximum permitted total weight of a vehicle when fully loaded, including the vehicle itself, fuel, occupants and cargo, as set by the manufacturer and shown on the compliance plate.

The maximum permitted total weight of a towing vehicle plus its laden trailer(s) combined, as specified by the manufacturer. Exceeding it overloads the driveline, brakes and tyres.

The weight of a vehicle in running order with fuel and fluids but without payload, driver or passengers. Tare mass subtracted from GVM gives the approximate payload available.

The weight of goods, passengers and any other load a vehicle can legally carry. It is the difference between the vehicle's gross vehicle mass and its tare mass.

The total weight carried by all wheels on one axle or axle group. Each axle or group has a legal limit, and overloading one axle is an offence even if total mass is legal.

The maximum weight legally allowed for a vehicle, combination, axle or axle group on a road. Limits vary with road type, and signs may impose lower limits on bridges or routes.

The system of straps, chains, gates or containers that stops a load moving or falling off. Loads must be restrained to meet performance standards for the forces expected in braking and cornering.

The combination of lashings, anchor points, headboards and other equipment used to secure cargo. It must be rated for the load and inspected before each trip for wear or damage.

NSW issues heavy vehicle classes LR, MR, HR, HC and MC, each covering different vehicle sizes and combinations. A higher class generally permits driving vehicles in the lower classes as well.

A restriction or requirement attached to a driver licence, such as wearing corrective lenses, driving only automatic vehicles, or a geographic or employment condition. Breaching a condition is an offence.

The health standard a heavy vehicle driver must meet, covering vision, hearing, heart conditions, diabetes, sleep disorders and medication effects. Drivers must report changes that affect their ability to drive safely.

A practical driving assessment for a heavy vehicle licence where an assessor observes the candidate performing required tasks and manoeuvres to confirm competence before the licence is issued.

The physical and mental tiredness that slows reactions, impairs judgement and increases crash risk. Fatigue is a major cause of heavy vehicle crashes and must be actively managed by drivers and operators.

The planning and practices used to control tiredness, including work and rest scheduling, adequate sleep, breaks, healthy eating and recognising warning signs in yourself and others.

A record kept by certain heavy vehicle drivers showing work time, rest time and other activities across each day. It must be filled in accurately and kept available for inspection by authorised officers.

A period of rest from driving work that counts toward fatigue management requirements. Minimum break length and frequency depend on the fatigue rules and hours already worked.

A check of the vehicle before driving, covering tyres, brakes, lights, fluids, load security, couplings and mirrors. It aims to find faults before they cause a breakdown or crash.

The routine inspection a driver performs each day on a heavy vehicle, often recorded in a checklist. It confirms safety items are working and documents any faults found.

A fault or damage in a vehicle or its equipment that affects or may affect safety, such as worn brakes, cracked lights or damaged tyres. Defects must be reported and repaired before further use.

A defect serious enough that the vehicle must not be driven until repaired, such as faulty brakes or steering. Driving a vehicle with a major defect is dangerous and illegal.

An official notice issued when a vehicle is found to have a defect, stating what must be fixed and any conditions on use. The vehicle may be grounded until repairs are verified.

A check of braking performance, often done during inspections or on a roller tester, to confirm the service and park brakes meet required standards. Poor results mean the vehicle is unsafe.

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

The mechanism linking a trailer to the towing vehicle, such as a tow ball, pintle hook or fifth wheel. It must be rated for the load, correctly latched and checked before driving.

The horseshoe-shaped coupling on a prime mover that grips the trailer's kingpin. Drivers must confirm it is locked and the release handle is secured before moving off.

A truck designed to tow a semi-trailer using a fifth wheel coupling. It carries part of the trailer load over its drive axles and is common in articulated combinations.

A combination where a prime mover tows a semi-trailer that pivots at the coupling. The joint allows tight turning but requires wider swings and careful reversing.

The extra space taken by the rear of a long vehicle as it turns, sweeping outside the path of the front wheels. Drivers must allow for it to avoid hitting kerbs, poles or other road users.

The space a vehicle needs to complete a turn, which is much larger for heavy vehicles. Poor turning circle planning can cause kerb strikes, lane encroachment or collisions.

The gap kept behind the vehicle ahead. Heavy vehicles need far more space to stop, so drivers should allow several seconds, increasing in rain, darkness or when fully loaded.

The total distance travelled from seeing a hazard to coming to a stop, including reaction distance and braking distance. It grows with speed, load and poor road or weather conditions.

An area around a heavy vehicle that the driver cannot see in mirrors, especially close alongside and directly behind. Other road users should avoid lingering there, and drivers must check carefully before manoeuvring.

Setting mirrors so the driver can see the sides, rear and relevant blind spots of the vehicle and load. Mirrors should be checked and cleaned as part of the pre-trip inspection.

Driving backwards, a high-risk manoeuvre for heavy vehicles. Drivers should use a guide or spotter where possible, check surroundings, reverse slowly and stop if visibility or guidance is unclear.

The principle that everyone in the supply chain, including drivers, operators, loaders, schedulers and consignors, shares responsibility for complying with heavy vehicle laws and safety duties.

A device fitted to many heavy vehicles that caps maximum speed, often at 100 km/h. It supports compliance with speed limits but does not replace the driver's duty to drive to conditions.

Substances or articles that pose risks such as fire, explosion, toxicity or corrosion during transport. They require correct classification, packaging, placarding, documentation and driver training.