
Alcohol is a drug that affects the central nervous system and brain function. In Australia, it is illegal to drive when your blood alcohol concentration (BAC) is 0.05% or above. This limit depends on the type of licence you hold and the vehicle you are driving. For example, learner drivers must have a 0.00% BAC. The police enforce this through random breath testing (RBT) roadblocks, and if you blow 0.05% or over, they will need to do a second test at a police station. If your second result is over the legal limit, you can be charged with driving under the influence (DUI). While drinking alcohol and driving is allowed in Australia, it is essential to know the restrictions and understand that drink-driving is a criminal offence with severe penalties.
| Characteristics | Values |
|---|---|
| Legal breath alcohol limit in Australia | 0.05% BAC |
| What it means | 0.05 g of alcohol in every 100 ml of blood |
| Who must have a 0.00% BAC | Learner drivers, pilots, drivers of public or heavy vehicles, operators of commercial ships or machinery |
| Drink driving laws | Each state has specific details |
| Drink driving penalties | Fine, licence cancellation, disqualification from driving, drink driving behaviour change program, alcohol interlock, prison term |
| Legal drinking age | 18 or older |
| Alcohol laws | Different in each state and territory |
| Alcohol guidelines | No more than 10 standard drinks a week and no more than 4 standard drinks on any one day |
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What You'll Learn

The legal breath alcohol limit in Australia is 0.05% BAC
The legal breath alcohol limit of 0.05% BAC in Australia is enforced through targeted and random roadside breath testing, also known as RBT. These tests are conducted by police officers at random breath testing roadblocks or if they suspect someone of drink-driving. If you blow a BAC of 0.05% or higher, the police will administer a second test at a police station. If your BAC is still above the legal limit, you can be charged with driving under the influence (DUI) and face legal consequences.
It is important to understand that alcohol affects everyone differently, and there is no exact amount of alcohol consumption that guarantees you will stay under the legal limit. Individual factors such as body size, food intake, body fat percentage, liver health, age, sex, alcohol tolerance, and medication can influence how alcohol is absorbed and metabolised in the body. Therefore, it is crucial to make informed decisions about drinking and driving.
In addition to the general legal breath alcohol limit of 0.05% BAC, there are specific requirements for certain types of licenses and professions in Australia. For example, learner and provisional drivers must have a zero BAC when driving, and there are similar restrictions for operating certain types of vehicles or machinery. These regulations are in place to ensure the safety of individuals and the community.
While the legal breath alcohol limit in Australia is 0.05% BAC, it is important to note that alcohol can still impact your driving ability even at lower levels. The Australian Alcohol Guideline recommends that healthy men and women consume no more than 10 standard drinks per week and no more than 4 standard drinks on any one day to reduce the risk of alcohol-related harm. It is always advisable to make informed choices and prioritise safety when it comes to drinking and driving.
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Drink driving laws vary across Australian states
Drink driving is a serious offence in Australia, with strict laws and penalties in place to deter people from drinking and driving. While the legal blood alcohol concentration (BAC) limit for fully licensed drivers across the country is 0.05%, drink-driving laws vary across Australian states and territories.
In New South Wales, for instance, there are three blood alcohol limits for drivers: zero, under 0.02, and under 0.05. The limit that applies depends on the type of licence and vehicle being driven. For instance, trucks over 13 tonnes carrying dangerous goods, buses, and taxis have a zero limit in Victoria, but this rises to 0.02 in NSW. NSW has also introduced harsher penalties for combined drink and drug driving offences since 28 June 2021. If caught drink driving in NSW, the police may suspend your licence immediately, and you may face significant penalties, including fines and prison terms.
In Queensland, first-time drink driving offenders may face licence disqualification, have their vehicles impounded (if BAC is .15 and over), pay fines of up to $8,625, or face a prison term determined by the court.
Western Australia employs a demerit system, with a fixed infringement fee of $1,000 to avoid being prosecuted in court for a BAC of .05 to .0079. Demerits range from three to five depending on recorded BAC levels.
Victoria has strict penalties for drink driving offenders, with heftier fines and extended driving disqualifications for subsequent offences. Jail time is reserved for more severe drunk driving motor offences, including manslaughter, negligently causing serious injury, and dangerous driving causing death or serious injury.
It's important to note that the BAC limit for learner or provisional licence holders is zero across Australia. Additionally, certain jobs, such as flying planes, driving public or heavy vehicles, and operating commercial ships or machinery, also have a zero BAC limit.
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The penalties for drink driving in Australia
In Australia, the legal breath alcohol limit is a Blood Alcohol Concentration (BAC) of 0.05%. If your BAC is 0.05% or over, the police will need to do a second test at a police station. If your second result is over the legal limit, you can be charged with driving under the influence (DUI).
Drink driving is a serious issue in Australia, costing hundreds of lives each year. Despite government-led campaigns and lawfully enforced penalties, drunk driving remains rampant, with statistics showing it as the number one contributing factor in about 30% of fatal crashes in Australia. Alcohol negatively affects driving skills and concentration. It impairs one's senses, making them more susceptible to mistakes as their alertness, reaction time, vigilance, and even vision become compromised.
In New South Wales, police may suspend your licence immediately if you are caught drink driving. If you are convicted, significant penalties apply, including fines and even prison terms. You will be disqualified from driving and may be ordered to install an alcohol interlock device.
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Alcohol testing in the workplace
In Australia, the legal breath alcohol limit is a Blood Alcohol Concentration (BAC) of 0.05%. This means that there is 0.05g of alcohol in every 100ml of blood. For learner drivers, the limit is 0.00% BAC.
Workplaces typically enforce alcohol testing when legally obligated or when deemed necessary by employers, workers, and unions. Blood alcohol concentration can be measured through breathalysers or by analysing blood, saliva, or urine samples. Saliva tests, such as the Alco-Screen, are simple to use and provide results within 10 minutes, making them convenient for workplace testing.
In certain jobs, there is a legal blood alcohol limit, including occupations in road and rail transport, maritime, and mining. For these roles, the BAC limit is often zero, meaning no alcohol is permitted within a certain period before performing the task, such as flying a plane or driving a heavy vehicle.
Companies with workers in safety-critical roles may also implement policies to test for alcohol, particularly if an employee could cause serious injury or harm to themselves or others. Counselling is often the first step in dealing with employees who test positive for alcohol, and further tests are conducted to ensure adherence to the company's drug-free policy.
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The legal drinking age in Australia
In Australia, an individual must be 18 or older to purchase alcohol or to drink alcohol in a licensed venue. It is illegal to sell alcohol to anyone under 18 or to someone who is already drunk. All packaged alcohol must show how many standard drinks it contains.
In some states and territories, it is legal to supply alcohol to a minor if you have approval from their parent or guardian. In others, only a parent or guardian may do so. In New South Wales (NSW), if a minor is caught with alcohol in a public place, it can be confiscated, guardians can be notified, and a maximum fine of $20 may be issued. An exception exists for minors consuming alcohol for religious purposes, such as Holy Communion.
While drinking laws vary across states and territories, the legal drinking age is the same across Australia. For example, in NSW, alcohol may not be sold to a person under 18 unless accompanied by a guardian or spouse and for consumption during a meal. Minors must not be on licensed premises unless accompanied by an adult or in other limited circumstances. In Queensland and Victoria, an alcoholic beverage is defined as one with greater than 0.5% alcohol by volume, whereas in most of Australia, it is defined as one with greater than 1.15% alcohol by volume.
Drink driving is illegal in Australia, with a blood alcohol concentration (BAC) limit of 0.05% for most drivers. For certain licenses, such as learner drivers, the BAC limit is 0.00%. In NSW, police have the power to conduct random breath testing (RBT) roadblocks, and if caught drink driving, an individual's license may be immediately suspended.
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Frequently asked questions
In Australia, the legal blood alcohol limit is 0.05%, which means there is 0.05g of alcohol in every 100ml of blood.
If you blow 0.05% or over, the police will need to do a second test at a police station. If your second result is over the legal limit, you can be charged with driving under the influence (DUI) and face stiff penalties.
Penalties for drink driving include fines, licence cancellation, disqualification from driving, and having an alcohol interlock device installed in your car.
Yes, your legal blood alcohol limit depends on the type of license you have. For example, learner drivers must have a 0.00% BAC in some states.
NSW has three blood alcohol limits for drivers: zero, under 0.02, and under 0.05. The limit that applies to you depends on your license and the type of vehicle you are driving.











































