Class 3 Theory Test cheat sheet

A Class 3 licence authorises driving heavy motor vehicles; in most jurisdictions the minimum age is 25 for a Class 3 (some allow 21 with a Class 2 held for a set period), so check the age threshold that applies where you are licensed.

Prerequisite pathway: a full car licence (Class 1) held for at least 2 years, or a Class 2 licence held for at least 6 months, is typically required before a Class 3 application is accepted.

Medical fitness: a current medical certificate (usually no more than 60-90 days old at application) is required, and drivers over a set age (commonly 75) must renew medicals more frequently.

Eyesight standard: corrected visual acuity of at least 6/9 in the better eye and 6/12 in the worse eye, with a horizontal visual field of at least 140 degrees, is the usual benchmark.

Application evidence typically includes proof of identity, proof of address, a current photo, the prerequisite licence, a medical certificate, and a passed theory test result.

Theory test must be passed before the practical/on-road assessment; the theory result normally has a limited validity window (commonly 12 months) before it lapses.

A criminal or traffic history check may be required; serious driving offences or disqualifications can delay or block eligibility.

Licence classes build upward: Class 1 (car) → Class 2 (medium rigid) → Class 3 (heavy combination/heavy rigid) → Class 4/5 for specialist heavy combinations, so the Class 3 is not the top of the ladder.

Class 3 covers heavy motor vehicles: typically a rigid vehicle with a gross vehicle mass (GVM) above 4,500 kg, or a heavy combination where the trailer's gross mass exceeds a set threshold (often 4,500 kg).

A Class 3 licence does NOT automatically allow a Class 4 vehicle (e.g. a heavy combination exceeding the Class 3 combination limit) or a Class 5 specialist vehicle; those require a higher class.

Light rigid (Class 2 territory) is generally GVM 4,500 kg or less with a gross combination mass (GCM) up to 12,000 kg; Class 3 begins above that band.

Class 3 allows towing a trailer within the permitted combination mass for that class; exceeding the combination mass moves the vehicle into a higher class.

A Class 3 licence does not authorise carrying passengers for hire or reward in a heavy passenger vehicle; that requires a passenger endorsement (P endorsement).

Dangerous goods transport requires a dangerous goods endorsement (D endorsement) in addition to the Class 3 licence.

A Class 3 licence does not cover motorcycles, tracked vehicles, or special-purpose vehicles unless separately endorsed.

The licence class is determined by the vehicle's GVM/GCM and configuration, not by the driver's experience or the load carried.

Pre-trip inspection checklist: tyres (tread depth, pressure, damage), brakes (air pressure build-up and leak-down), lights, mirrors, coupling/locking pins, load restraints, and fluid levels.

Air brake system: with the engine off, pressure should build from 0 to operating pressure within a set time; a leak-down test should show no more than a specified pressure drop (commonly 10 psi in 1 minute with the engine off and brakes applied).

Load restraint: loads must be restrained so they cannot move or fall; the restraint system must withstand the forces of braking, acceleration, and cornering (commonly 0.8 g forward, 0.5 g sideways and rearward).

Certificate of Inspection (COI) / periodic inspection: heavy vehicles must pass a periodic safety inspection at an authorised inspection station at intervals set by the regulator (often annually or every 6-12 months depending on vehicle age and class).

Heavy vehicle national law (HVNL) chain of responsibility: parties in the supply chain (scheduler, consignor, loader, driver, operator) share responsibility for safety, fatigue, speed, mass, and load restraint.

Fatigue management: work and rest hours are prescribed (e.g. standard fatigue hours with minimum continuous rest breaks); a work diary must be kept and produced on demand.

Defect reporting: a driver who identifies a safety defect must report it and the vehicle must not be used until repaired; major defects require the vehicle to be taken out of service.

Speed limiter: heavy vehicles (particularly heavy combinations and buses) are typically required to be speed-limited to 100 km/h, and tampering with a speed limiter is an offence.

Road user charges (RUC) are a distance-based charge paid in advance for vehicles that do not pay fuel excise at the pump; heavy vehicles are the primary RUC payers.

RUC is calculated as: RUC rate (per 1,000 km for the vehicle's RUC weight band and type) × distance purchased. RUC = (distance in km ÷ 1,000) × rate per 1,000 km.

The RUC weight band is based on the vehicle's GVM (or GCM for combinations); the operator must purchase RUC for the correct weight band and configuration.

A RUC licence (distance licence) must be carried in the vehicle and displayed; operating without a current RUC licence or exceeding the purchased distance is an offence with penalty.

RUC is purchased in advance in units (commonly 1,000 km increments); the odometer reading at purchase and the distance purchased are recorded on the licence.

Refunds or transfers of unused RUC distance may be available when a vehicle is sold or deregistered, subject to the regulator's rules.

Heavy vehicle operators must also maintain records: logbooks/work diaries, maintenance records, and RUC purchase records, which may be audited.

Operating costs beyond RUC include registration, insurance (including compulsory third party and heavy vehicle insurance), maintenance, and fuel; RUC is separate from and additional to fuel excise where applicable.

Knowledge test content for Class 3 typically covers heavy vehicle road rules, load restraint, fatigue, and vehicle inspection basics; a pass mark (often 80-90%) applies.

Application must be made in person at a licensing authority with original documents; photocopies are generally not accepted for identity and medical evidence.

A driver's licence photo and signature are captured at application; the licence is issued after the theory and practical requirements are met.

Conditions may be imposed (e.g. corrective lenses, automatic transmission only, or geographic restrictions); conditions must be complied with while driving.

Notification duties: a change of address or name must be notified to the licensing authority within a set period (commonly 14-28 days).

A licence can be suspended or cancelled for demerit point accumulation, serious offences, or medical unfitness; driving while suspended is an offence.

Class 3 does not permit driving a vehicle carrying placarded dangerous goods without the D endorsement, nor a heavy passenger vehicle without the P endorsement.

Trailer towing under Class 3 is limited to the combination mass permitted for the class; a heavier combination requires a higher class.

A Class 3 licence holder may drive a light vehicle (Class 1) and a medium rigid vehicle (Class 2) as well, because higher classes include lower ones.

Heavy vehicle definition commonly begins at GVM over 4,500 kg; vehicles at or below that are light or medium rigid, not Class 3.

Special-purpose vehicles (cranes, forklifts, agricultural machines) may require a separate endorsement or a special-purpose vehicle licence, not just Class 3.

Tyre requirements: minimum tread depth (commonly 1.5 mm for heavy vehicles) and no significant cuts, bulges, or exposed cords; tyre pressure must suit the load.

Brake performance: heavy vehicles must meet a specified deceleration standard (e.g. service brake performance measured in m/s²) at periodic inspection.

Coupling systems: fifth wheel, kingpin, and safety chains must be inspected for wear and correctly engaged before towing; a pre-trip tug test is standard practice.

Load restraint systems: straps, chains, and binders must have a stated lashing capacity (LC) and be rated for the load; the sum of restraint capacity must exceed the load's restraint requirement.

Inspection records and maintenance schedules must be kept and made available to authorised officers on request.

Chain of responsibility breaches can attract penalties for parties who consign, load, schedule, or receive goods, not only the driver.

RUC distance licences are vehicle-specific and weight-band-specific; buying RUC for a lower weight band than the vehicle's actual GVM is an offence.

The odometer must be accurate; tampering with or disconnecting an odometer to avoid RUC is a serious offence.

RUC rates are set by the regulator and vary by vehicle type (e.g. heavy rigid vs heavy combination) and by weight band.

Operators should reconcile RUC purchases against odometer readings regularly to avoid running out of purchased distance.

RUC is distinct from registration and from fuel excise; where fuel excise is paid at the pump for some vehicles, RUC may be reduced or exempt, so check the vehicle's category.

Penalties for RUC offences can include infringement fines, back-dated charges, and licence suspension for repeat offences.

Medical conditions that must be declared include epilepsy, diabetes requiring insulin, sleep disorders, heart conditions, and vision disorders; undisclosed conditions can invalidate the licence.

A medical practitioner may impose restrictions or require periodic review; the licensing authority makes the final fitness decision.

Theory tests are usually computer-based and can be re-taken after a waiting period (commonly 7 days) if failed.

The practical assessment for Class 3 is conducted by an authorised assessor and covers pre-trip inspection, coupling, driving, and load restraint.

Licence class is printed on the licence card; driving outside the class is an unlicensed-driving offence.

Heavy combination vehicles (truck and trailer) may fall under Class 3 or Class 4 depending on the combination mass; the dividing line is set by the regulator.

A Class 3 licence does not authorise driving a vehicle with a GVM above the class limit even if the vehicle is unladen; GVM, not actual weight, governs.

Endorsements (P, D, and others) are added to the base class and must be applied for separately with their own eligibility and testing requirements.

Periodic inspection intervals may shorten for older vehicles or vehicles used for particular purposes (e.g. passenger, dangerous goods).

A vehicle that fails inspection may be issued a defect notice; the vehicle must be repaired and re-inspected before returning to service.

Emergency equipment: fire extinguishers, warning triangles, and reflective vests are commonly required for heavy vehicles.

Driver fatigue: a work diary must record work and rest; falsifying a work diary is an offence.

Speed and mass limits are enforced through roadside checks and weighbridges; overloading is a chain of responsibility offence.

RUC licences are generally purchased online or at authorised agents; the licence must be displayed in the vehicle.

When a vehicle is sold, unused RUC distance may be transferred or refunded subject to the regulator's process.

Operators should keep RUC receipts and odometer records for audit purposes; records must be retained for a set period (commonly 7 years).

RUC evasion can result in infringement fees and, for repeat or serious cases, prosecution.

Operating cost planning for a heavy vehicle should include RUC, registration, insurance, maintenance, tyres, and fuel as separate line items.