Rules and laws in Western Australia (2026)

Last reviewed: 15 October 2026

Every rule we have verified for Western Australia, by topic. The last column shows how each rule compares with the other states and territories.

E-scooters

RuleWhat appliesCompared with other states
Use on public roadsAllowed (source: Government of Western Australia (Road Safety Commission))Same in 4 of 6 other states checked
Driving licenceNo driver's licence is needed: an electric rideable device may be driven on a road without one. (source: Government of Western Australia, Parliamentary Counsel's Office)
Minimum age16 years (source: Government of Western Australia (Road Safety Commission))Same in 3 of 4 other states checked
Helmet requiredYes (source: Government of Western Australia (Road Safety Commission))Same in 5 of 5 other states checked
Plate or stickerNo vehicle licence (registration) is required for an electric rideable device. (source: Government of Western Australia, Parliamentary Counsel's Office)
Maximum speedup to 25 km/h (design speed) (source: Government of Western Australia (Road Safety Commission))Same in 4 of 5 other states checked
Where to rideFootpaths (10 km/h), bicycle paths and shared paths (25 km/h), and roads and bicycle lanes with a speed limit of 50 km/h or less (25 km/h). Not on roads above 50 km/h or paths marked 'no wheeled devices'. (source: Government of Western Australia (Road Safety Commission))
Passengers allowedNo (source: Government of Western Australia (Road Safety Commission))Same in 5 of 5 other states checked

Cannabis

RuleWhat appliesCompared with other states
Possession for personal usePersonal use by an adultCriminal offence (source: Western Australia Government (Parliamentary Counsel's Office))Same in 4 of 7 other states checked
Quantity limitsPersonal use by an adultThere is no lawful amount. For a minor cannabis related offence (possession of not more than 10 g of cannabis, not a plant under cultivation, resin or another derivative), police may give a cannabis intervention requirement instead of prosecution; an adult who has already been convicted of such an offence or given a requirement cannot be given another. (source: Western Australia Government (Parliamentary Counsel's Office))
Growing at homePersonal use by an adultProhibited (source: Western Australia Government (Parliamentary Counsel's Office))Same in 6 of 7 other states checked
Sale to consumersPersonal use by an adultProhibited (source: Western Australia Government (Parliamentary Counsel's Office))Same in 7 of 7 other states checked
Use or carrying in public placesPersonal use by an adultProhibited (source: Western Australia Government (Parliamentary Counsel's Office))Same in 7 of 7 other states checked
Medical cannabisPersonal use by an adultLegal for medical use (source: Department of Health, Western Australia)Same in 6 of 6 other states checked

Car speed limits

RuleWhat appliesCompared with other states
Built-up areasPassenger car on public roads50 km/h default speed limit in built-up areas (source: Main Roads Western Australia)
Outside built-up areas (single carriageway)Passenger car on public roads110 km/h default speed limit in rural or undeveloped areas (source: Main Roads Western Australia)
School zonesPassenger car on public roads40 km/h in school zones and at children's crossing zones, enforced on school days from 7.30 to 9.00am and 2.30 to 4.00pm (source: Main Roads Western Australia)
Roadworks zonesPassenger car on public roadsThe speed limit must be followed at all times, including a reduced limit through roadwork areas. All roadwork signs must be followed even when no road workers can be seen. (source: Main Roads Western Australia)

Deposit return schemes and plastic bags

RuleWhat appliesCompared with other states
National deposit return scheme in operationDeposit on drinks containersYes (source: Government of Western Australia)Same in 7 of 7 other states checked
Containers coveredDeposit on drinks containersDrink containers between 150 mL and 3 L, including wine, spirits, beer and cider, spirit-based mixed drinks, cordial, fruit and vegetable juices, flavoured milk, soft drinks, sports drinks and water, Excluded: containers for plain milk, registered health tonics and food for special medical purposes (source: Government of Western Australia)
Deposit per containerDeposit on drinks containers0.10 AUD per container (source: Government of Western Australia)Same in 7 of 7 other states checked
Plastic carrier bag rulePlastic carrier bagsBanned (source: Western Australian Department of Water and Environmental Regulation)Same in 7 of 7 other states checked
Price of plastic carrier bagsPlastic carrier bagsThe sale, supply and distribution of banned bags is prohibited for all businesses, manufacturers, retailers, wholesalers and distributors. The ban does not apply to personal use of bags already owned. (source: Western Australian Department of Water and Environmental Regulation)
Bag thickness rulePlastic carrier bagsThe ban covers all soft plastic carry (shopping) bags with handles that are wholly or partly plastic, including bags of heat-sealed non-woven polypropylene, non-woven polypropylene under 90 grams per square metre, degradable, biodegradable, oxo-degradable and compostable plastic, and plastic-laminated paper or cardboard. Barrier bags, bags that are part of sealed packaging and certain woven or sewn fabric bags are not covered. (source: Western Australian Department of Water and Environmental Regulation)

Minimum age for a car driving licence

RuleWhat appliesCompared with other states
Minimum age for a car licenceCar (category B) driving licence17 years (source: Department of Transport (Western Australia))Same in 5 of 7 other states checked
Earliest age to drive a car supervisedCar (category B) driving licence16 years (source: Western Australian Government)Same in 6 of 7 other states checked
Driving before the minimum ageCar (category B) driving licenceA learner's permit is available from 16. The Practical Driving Assessment for the provisional licence needs age 17 or older, the permit held for at least 6 months, at least 50 hours of supervised driving including 5 at night (if under 25) and the hazard perception test. (source: Department of Transport (Western Australia))
Visitors on a foreign licence: ageCar (category B) driving licenceA visitor from overseas or another Australian state or territory may use a current driver's licence in Western Australia, following the WA road rules, any conditions of the licence and, for a provisional driver, the provisional driver restrictions. A visitor from another state or territory may drive on a current learner's permit with a supervising driver and L plates. The page states no age condition. (source: Department of Transport and Major Infrastructure (Western Australia))
Learner's permit from ageCar (category B) driving licence16 years (source: Western Australian Government)Same in 6 of 7 other states checked
Supervised driving hours requiredCar (category B) driving licenceAt least 50 hours of supervised driving, including 5 hours at night (if under 25), recorded in the learner log book or the Learn&Log app. Applicants aged 25 or older are exempt from the log book requirement. (source: Department of Transport (Western Australia))
Night-time limit for new driversCar (category B) driving licenceA red P-plate driver (first 6 months of the provisional licence) must not drive between midnight and 5am, unless travelling directly to or from work or school or as part of work duties. (source: Road Safety Commission (Western Australia))
Passenger limit for new driversCar (category B) driving licenceA red P-plate driver (first 6 months) may carry only one passenger at a time, subject to exemptions. A learner driver has no passenger limit beyond a seat belt or child restraint for each passenger. (source: Road Safety Commission (Western Australia))
Tests for a first car licenceCar (category B) driving licenceProvisional licence: the Hazard Perception Test and the Practical Driving Assessment. (source: Department of Transport (Western Australia))
How long the licence is validCar (category B) driving licenceA learner's permit is valid for 3 years; after it expires a new application is needed. (source: Western Australian Government)

Driving after drugs

RuleWhat appliesCompared with other states
Approach to cannabis (THC)Driving a car after drug useAny use is an offence (source: Road Safety Commission (Western Australia))Same in 7 of 7 other states checked
THC thresholdDriving a car after drug useCannabis is a specified drug; having it in oral fluid or blood is an offence and the page gives no numeric limit. (source: Road Safety Commission (Western Australia))
Police screening testDriving a car after drug useYes (source: Road Safety Commission (Western Australia))Same in 7 of 7 other states checked
Main sanctionsDriving a car after drug useFirst offence: fine of up to AUD 1,250 and 3 demerit points; second or later offence: AUD 1,250 to 2,000 and at least 6 months' disqualification. A positive roadside test brings a 24-hour driving ban. (source: Road Safety Commission (Western Australia))

E-bikes and speed pedelecs

RuleWhat appliesCompared with other states
Legal classRiding on public roadsBicycle rules (source: Government of Western Australia (Road Safety Commission))Same in 6 of 6 other states checked
Assistance stops atRiding on public roadsup to 25 km/h (design speed) (source: Government of Western Australia (Road Safety Commission))Same in 4 of 4 other states checked
Maximum motor powerRiding on public roadsPedalec (EN 15194): electric motor up to 250 W. Any other power-assisted pedal cycle: electric or petrol motor up to 200 W. With more than one motor the limit applies to the combined output. (source: Government of Western Australia (Road Safety Commission))
Minimum ageRiding on public roads16 years or older. Regulation 228 prohibits people under 16 from riding eBikes with the power assistance engaged. (source: Government of Western Australia (Road Safety Commission))
HelmetRiding on public roadsAn approved bicycle helmet, securely fastened, must be worn (unless exempt). Legal eBikes are bicycles under the Road Traffic Code 2000, so the bicycle helmet rule applies. (source: Government of Western Australia (Road Safety Commission))
LicenceRiding on public roadsNo driver's licence is needed to drive a power assisted pedal cycle on a road: regulation 55 of the Road Traffic (Authorisation to Drive) Regulations 2014 authorises it without a licence. (source: State Law Publisher, Government of Western Australia)
Cycle pathsRiding on public roadsLegal eBike riders follow the same rules as bicycle riders. Cyclists of all ages may ride on footpaths unless signed otherwise, in single file, giving way to pedestrians. (source: Government of Western Australia (Road Safety Commission))

Fireworks

RuleWhat appliesCompared with other states
Consumers may buy and use category F2 fireworksConsumer fireworks (category F2)No (source: WorkSafe Western Australia (Department of Energy, Mines, Industry Regulation and Safety))Same in 5 of 7 other states checked
When they may be sold to the publicConsumer fireworks (category F2)A licence is needed to purchase fireworks. The page names bon-bons, party poppers, Christmas crackers, throwdowns and sparklers as unrestricted fireworks that the public may use. (source: WorkSafe Western Australia (Department of Energy, Mines, Industry Regulation and Safety))
When they may be let offConsumer fireworks (category F2)Fireworks can only be used by licensed pyrotechnicians or people under their direct supervision. Use by the general public is banned except for unrestricted fireworks. (source: WorkSafe Western Australia (Department of Energy, Mines, Industry Regulation and Safety))
Fireworks consumers may useConsumer fireworks (category F2)Unrestricted fireworks such as bon-bons, party poppers, Christmas crackers, throwdowns and sparklers may be used by the general public. (source: WorkSafe Western Australia (Department of Energy, Mines, Industry Regulation and Safety))

Home education

RuleWhat appliesCompared with other states
Nature of the parental dutyChildren of compulsory school ageDuty to attend or be enrolled at school (source: Parliamentary Counsel's Office, Western Australia)Same in 7 of 7 other states checked
Approval or notification neededChildren of compulsory school ageOnly a parent (including a legal guardian) can register as the home educator, through the Department of Education. Applications are to be made within 14 days of the last day the child attended school, or when they would have first enrolled. From the date the registration certificate is issued the home educator is responsible for the child's educational programme. A home education moderator evaluates the programme and progress. (source: Western Australian Department of Education)
Compulsory schooling ageChildren of compulsory school ageThe compulsory education period runs from the beginning of the year in which the child reaches 5 years and 6 months until the first of: the end of the year in which the child reaches 17 years and 6 months, the child reaches 18, or the child meets the minimum requirements for graduation from secondary school. (source: Western Australian Department of Education)

Knives and pepper spray

RuleWhat appliesCompared with other states
Folding pocket knivesCarrying in public placesIt is an offence to carry or possess an edged weapon, including a knife, without a lawful excuse anywhere in Western Australia (maximum 3 years' imprisonment and a fine of $36,000). A plastic or wooden knife designed for eating, and a knife with a rounded tip and dull edge, are not edged weapons. (source: Western Australia Police Force)
Locking or one-handed knivesCarrying in public placesA knife with a blade concealed when folded or recessed into the handle that opens by gravity, centrifugal force or pressure on a button, spring or device (flick knife or switchblade), and a butterfly knife, are prohibited weapons if made or modified to injure or disable a person or as a martial arts weapon. Carrying or possessing a prohibited weapon is a crime (up to 5 years' imprisonment and a $60,000 fine). (source: Western Australia Police Force)
Fixed-blade knivesCarrying in public placesA fixed blade knife is an edged weapon, and carrying or possessing one without a lawful excuse is an offence. A person with a lawful excuse also commits an offence by carrying it in a way that could reasonably be expected to cause someone to be injured or to fear injury. (source: Western Australia Police Force)
Pepper sprayCarrying in public placesA capsicum spray weapon (a spray weapon made or modified to discharge oleoresin capsicum) is a controlled weapon. Carrying or possessing one without a lawful excuse is an offence (maximum 2 years' imprisonment and a $24,000 fine). Defence is not normally a lawful excuse, but a person may carry or possess a capsicum spray weapon for use in lawful defence in circumstances the person has reasonable grounds to apprehend may arise. (source: Government of Western Australia (State Law Publisher))
Exceptions and legitimate reasonsCarrying in public placesA lawful excuse includes carrying or possessing a weapon for a lawful employment, duty or activity, a lawful sport, recreation or entertainment, or a lawful collection, display or exhibition of weapons. Defence is not a lawful excuse, except that a capsicum spray weapon or approved electric shock case may be carried for use in lawful defence in circumstances the person has reasonable grounds to apprehend may arise. Police, special constables, certain police-service staff and public transport security officers are exempt when performing their functions, and custodial officers are exempt for capsicum spray weapons. The person carrying the weapon must prove any exception or lawful excuse. (source: Government of Western Australia (State Law Publisher))
Automatic (switchblade) knivesCarrying in public placesA flick knife or switchblade, being a knife whose blade is concealed when folded or recessed into the handle and opens by gravity, centrifugal force or pressure on a button, spring or device, is a prohibited weapon if made or modified to injure or disable a person or as a martial arts weapon. (source: Western Australia Police Force)
Blade length limitsCarrying in public placesThe edged weapon offence has no blade-length threshold. A dagger is a controlled weapon if it is a sharp pointed stabbing knife with a flat blade exceeding 8 cm with non-serrated cutting edges on both sides, or a needle-like blade. (source: Western Australia Police Force)
Pepper spray: size and age limitsCarrying in public placesThe Weapons Regulations 1999 set no container size or minimum age for a capsicum spray weapon, and regulation 7 lets a person carry or possess one for use in lawful defence in circumstances the person has reasonable grounds to apprehend may arise. Selling or supplying a controlled weapon to a child (a person under 18) is an offence (maximum 2 years' imprisonment and a fine of $24,000). (source: Government of Western Australia (State Law Publisher))

Mopeds

RuleWhat appliesCompared with other states
Minimum age to ridePrivately owned15.5 years (source: Department of Transport and Major Infrastructure (Western Australia))Differs from all 1 other states checked
LicencePrivately ownedMoped (R-N class) licence, obtained through a learner's permit, theory and hazard perception tests and a practical assessment. Holders of a Western Australian driver's licence for another class (not a learner's permit) may ride a moped without it. (source: Department of Transport and Major Infrastructure (Western Australia))
Helmet requiredPrivately ownedYes (source: Road Safety Commission (Western Australia))Same in 6 of 6 other states checked
Maximum design speedPrivately ownedup to 50 km/h (design speed) (source: Department of Transport and Major Infrastructure (Western Australia))Same in 5 of 5 other states checked

Motorcycles: helmets and licences

RuleWhat appliesCompared with other states
Helmet required for the riderRiding a motorcycle; MotorcycleYes (source: Road Safety Commission (Western Australia))Same in 6 of 6 other states checked
Helmet required for a passengerRiding a motorcycle; MotorcycleYes (source: Road Safety Commission (Western Australia))Same in 6 of 6 other states checked
RuleWhat appliesCompared with other states
Minimum paid leave a year (weeks)Full-time employee; Western Australian employees of constitutional corporations (national system)4 weeks (source: Fair Work Commission)No other state checked yet
Minimum paid leave as the law states itFull-time employee; Western Australian employees of constitutional corporations (national system)Full-time and part-time employees get 4 weeks of paid annual leave a year, based on their ordinary hours of work. Shiftworkers get more than 4 weeks if their award or enterprise agreement provides the extra week under the National Employment Standards. Casual employees do not get paid annual leave. (source: Fair Work Ombudsman)
National public holidays a yearFull-time employee; Western Australian employees of constitutional corporations (national system)13 days (source: Government of Western Australia)No other state checked yet
Public holidays and annual leaveFull-time employee; Western Australian employees of constitutional corporations (national system)Not counted as leave days (source: Fair Work Ombudsman)No other state checked yet
Minimum paid leave a year (weeks)Full-time employee; Western Australian employees in the state industrial relations system4 weeks (source: Government of Western Australia (Private Sector Labour Relations))No other state checked yet
Minimum paid leave as the law states itFull-time employee; Western Australian employees in the state industrial relations systemFull-time and part-time employees in the WA state system are entitled each year of service to paid annual leave equal to the hours they ordinarily work in a 4-week period, up to a maximum of 152 hours. Casual employees are not entitled to paid annual leave. Awards, agreements and contracts can give more. (source: Government of Western Australia (Private Sector Labour Relations))
National public holidays a yearFull-time employee; Western Australian employees in the state industrial relations system13 days (source: Government of Western Australia)No other state checked yet
Public holidays and annual leaveFull-time employee; Western Australian employees in the state industrial relations systemNot counted as leave days (source: Government of Western Australia (Private Sector Labour Relations))No other state checked yet

Using a mobile phone while driving

RuleWhat appliesCompared with other states
Holding a phone while driving bannedUsing a mobile phone while driving a carYes (source: Road Safety Commission (Western Australia))Same in 7 of 7 other states checked
Hands-free useUsing a mobile phone while driving a carAllowed with limits (source: Road Safety Commission (Western Australia))Same in 7 of 7 other states checked
Fine, first offence (lowest amount where a range applies)Using a mobile phone while driving a car500.00 AUD per offence (source: Road Safety Commission (Western Australia))Same in 1 of 5 other states checked
Penalty points on the licenceUsing a mobile phone while driving a car3 points (source: Road Safety Commission (Western Australia))Same in 3 of 6 other states checked
Texting while drivingUsing a mobile phone while driving a carCreating, sending or looking at a text, email, social media, photo, video or similar is a serious offence (AUD 1,000, 4 demerit points). (source: Road Safety Commission (Western Australia))
Can police stop you for this alone?Using a mobile phone while driving a carSafety cameras that can detect illegal mobile phone use in vehicles are in use. (source: Road Safety Commission (Western Australia))

Seat belts and child seats

RuleWhat appliesCompared with other states
Seat belt compulsory in front seatsPassenger carsYes (source: Department of Transport (WA))Same in 7 of 7 other states checked
Seat belt compulsory in rear seatsPassenger carsYes (source: Department of Transport (WA))Same in 7 of 7 other states checked
Child restraint required untilPassenger cars0 to 6 months: rear-facing child restraint. 6 months to under 4 years: rear- or forward-facing restraint with an in-built harness. 4 to under 7 years: forward-facing child seat or booster seat with a seatbelt or child safety harness. 7 to 16 years: suitable child seat or adult seatbelt. (source: Department of Transport (WA))
Children in the front seatPassenger cars0 to under 4 years: not in the front row if the vehicle has 2 or more rows. 4 to under 7 years: front seat only if all other rear seats are filled with passengers aged under 7. 7 to 16 years: front or rear seats. (source: Department of Transport (WA))
Fine for not wearing a seat beltPassenger carsA driver who does not ensure children are properly restrained could get a fine and lose demerit points (source: Department of Transport (WA))
Booster seat untilPassenger carsChildren aged 4 to under 7 may use a booster seat with a seatbelt or child safety harness; children aged 7 to 16 use a suitable child seat or adult seatbelt. (source: Department of Transport (WA))
Can police stop you for this alone?Passenger carsSafety cameras detect seatbelt offences; camera enforcement started on 8 October 2025 after an eight-month warning period, and 60,200 seatbelt infringements had been issued by 20 May 2026 (source: Government of Western Australia)

Smoke alarms in homes

RuleWhat appliesCompared with other states
Smoke alarm legally required in homesSmoke alarms in dwellings; Dwellings rented under a residential tenancy agreement, used as short-term rental accommodation or made available for hire (Building Regulations 2012, regs 58, 59 and 62)Yes (source: Government of Western Australia (State Law Publisher))No other state checked yet
Who must fit the alarmsSmoke alarms in dwellings; Dwellings rented under a residential tenancy agreement, used as short-term rental accommodation or made available for hire (Building Regulations 2012, regs 58, 59 and 62)Owner (source: Government of Western Australia (State Law Publisher))No other state checked yet
Who must keep them workingSmoke alarms in dwellings; Dwellings rented under a residential tenancy agreement, used as short-term rental accommodation or made available for hire (Building Regulations 2012, regs 58, 59 and 62)Landlord (source: Government of Western Australia (State Law Publisher))No other state checked yet

Tobacco and nicotine age limits

RuleWhat appliesCompared with other states
Minimum age to buy tobaccoTobacco and nicotine products18 years (source: Government of Western Australia (State Law Publisher))Same in 7 of 7 other states checked
Nicotine pouchesTobacco and nicotine productsSale banned (source: Therapeutic Goods Administration (TGA))Same in 7 of 7 other states checked
Smoking ban in indoor public placesTobacco and nicotine productsYes (source: Government of Western Australia (State Law Publisher))Same in 7 of 7 other states checked
E-cigarettes in indoor public placesTobacco and nicotine productsYes. In the Act 'smoke' includes using a vaping device that generates or releases aerosol or vapour, so the ban on smoking in enclosed public places covers vaping. (source: Government of Western Australia (State Law Publisher))
Smoking in cars with childrenTobacco and nicotine productsSmoking is banned in or on a vehicle on a road if another person in or on the vehicle is under 17. 'Smoke' includes using a vaping device. (source: Government of Western Australia (State Law Publisher))
Flavoured tobacco and e-cigarettesTobacco and nicotine productsYes. Commonwealth law, which applies in Western Australia, bans tobacco products that contain flavouring additives, menthol or menthol derivatives, fruit, spices, sugars or sweeteners, synthetic cooling agents, or a device such as a card, capsule or bead that alters flavour. (source: Federal Register of Legislation (Commonwealth))

Towing trailers and caravans

RuleWhat appliesCompared with other states
Maximum speed on motorways when towingCar with a trailer or caravan; Car with a trailer or caravan100 km/h (source: Government of Western Australia (Road Safety Commission))
Higher categories for trailers (B96, BE)Car with a trailer or caravanA Light Rigid (LR) licence also allows towing a trailer up to the maximum weight recommended by the vehicle manufacturer or detailed by law. Medium Rigid (MR) and Heavy Rigid (HR) licences allow towing a trailer with a GVM of 9,000 kg. (source: Government of Western Australia)
Extra mirrors when towingCar with a trailer or caravanIf towing a load wider than the vehicle, towing mirrors must be in place. (source: Government of Western Australia (Road Safety Commission))

Drinking age and alcohol sales

RuleWhat appliesCompared with other states
Minimum age to buy beer and wineBuying and drinking alcohol18 years (source: Government of Western Australia)Same in 7 of 7 other states checked
Minimum age to buy spiritsBuying and drinking alcohol18 years (source: Government of Western Australia)Same in 7 of 7 other states checked
Drinking by younger people with an adultBuying and drinking alcoholIt is an offence to supply a juvenile (under 18) with alcohol in a private setting without parental or guardian permission (maximum fine $10,000). On licensed premises a juvenile may be present with a responsible adult (a parent, step-parent, spouse, de facto partner, legal guardian or person acting in place of a parent) or to obtain a meal. (source: Government of Western Australia)
Drinking in public placesBuying and drinking alcoholDrinking in public places is an offence, with a $200 infringement or maximum $2,000 fine for drinking on streets, in parks or on beaches. (source: Government of Western Australia)
Where and when alcohol is soldBuying and drinking alcoholSelling or supplying alcohol to a juvenile on licensed premises is an offence for the licensee, any supervising manager and others ($10,000 for a licensee or manager, $4,000 for another person who sells or supplies, $2,000 for any other person involved). Allowing a juvenile to consume alcohol on licensed premises is an offence ($10,000 licensee or manager, $4,000 others). Sending a juvenile to buy alcohol carries a $2,000 fine. (source: Government of Western Australia)

Drink-driving limits

RuleWhat appliesCompared with other states
Lower limit for novice or young driversDriving after drinking alcohol0.00%: a zero BAC applies to novice drivers (learner and provisional), holders of extraordinary licences and recently disqualified drivers. (source: Government of Western Australia, Road Safety Commission)
Limit for professional or commercial driversDriving after drinking alcohol0.00%: drivers of vehicles over 22.5 tonnes GCM, vehicles carrying dangerous goods, buses carrying passengers (equipped for more than 12 adults), small charter vehicles and taxis carrying passengers. (source: Government of Western Australia, Road Safety Commission)
Maximum penaltiesDriving after drinking alcoholFirst offence at 0.15 or more with no relevant prior: a fine of AUD 1,700 to AUD 3,750 and at least 10 months' disqualification; second offence AUD 3,150 to AUD 5,250 (or 9 months in prison) and at least 30 months; third or later AUD 3,150 to AUD 7,500 (or 18 months in prison) and disqualification for life. (source: Government of Western Australia, Road Safety Commission)
Blood alcohol limit for ordinary driversDriving after drinking alcohol0.05 % blood alcohol (source: Government of Western Australia, Parliamentary Counsel's Office)Same in 7 of 7 other states checked
Random breath tests without suspicionDriving after drinking alcoholYes (source: Government of Western Australia, Parliamentary Counsel's Office)Same in 7 of 7 other states checked

General information, not legal advice. Rules change: check the official source before you fly or ride.