NRSPP Australia » Am I right to drive? Understanding how drinking affects your BAC ‘the morning after’ (2024)

Road safety campaigns and police enforcement have dramatically reduced drink driving since the first ‘booze bus’ hit Australian roads and the first drink driving campaign hit our screens in the 1980s.

However, drink drivers still make up a large percentage of the statistics. Drink driving is the number one contributing factor in almost a third of fatal crashes in Australia and more than a quarter of drivers and riders killed on Australian roads have a BAC exceeding the legal limit.

At just 0.02 your odds of being involved in a fatal crash have already doubled, compared to not drinking alcohol at all, and at 0.08 BAC you’re 13 times more likely to be involved in a fatal crash.

While it’s different for everybody and is influenced by things like gender, body size, level of fitness, liver state and what you’ve eaten, a rough rule of thumb for a fully licensed driver to remain under the BAC limit is:

  • males can have 2 standard drinks in the first hour and 1 standard drink every hour after that; females can have no more than 1 standard drink every hour
  • allow at least one hour for your body to process each standard drink. So, for example, if you’ve had five full strength pots of beers or four glasses of wine, you’d need to wait at least six hours before thinking about getting behind the wheel. The legal BAC limit for a Learner or P driver is zero, which means no alcohol at all when driving.

Re:act

Many of us enjoy a night out with a few drinks and good company. While most are well aware of the risks associated with drinking and driving, the dangers of driving the morning after having a few drinks is less understood.

Heavy drinking or drinking late into the night can easily leave you with blood alcohol levels that are too high to drive legally or safely the next morning. Keeping track of how much you drink and allowing enough time to recover are vital if you need to drive the morning after drinking the previous night.

During the UN Global Road Safety Week (May 8–14), the 2017 Re:act campaignhighlighted ‘the morning after’ message. Re:act is an innovative behavioural change project designed to influence the choices 18–25 year olds make by increasing awareness of the dangers they may face on the roads.

Melbourne creative agency Hard Edge started the initiative in 2016 in collaboration with Swinburne University and with support from several organisations with a passion for improving road safety, including the Transport Accident Commission, RACV, Transurban and ARRB Group, which coordinates the National Road Safety Partnership Program.

Each year Swinburne design students are challenged to create a campaign aimed at changing behaviour around road safety and social issues relevant to 18–25 year olds. The 2017 campaign asks young drivers to consider if they should be getting behind the wheel the morning after drinking heavily or late into the night.

In 2016, the brief was to reduce mobile phone use while driving.

Entries in the 2017 campaign will be judged on May 25, with the winning entry to be developed and rolled out on the Swinburne campus.

HOW LONG SHOULD I WAIT?

Dinner and wine
Saturday night dinner and drinks at a friend’s house. You start with a glass of wine at 7.30pm and by the time you’ve polished off dessert, it’s 11.30pm and you’ve had two bottles of wine.
Standard drinks: 15
Don’t drive before: 10.30am. Stay over and sleep in.

A few after work
A few ‘well-earned’ beers after a busy week of work and study. Your first beer is at 5pm, and it’s going down easy so by 9pm you’ve polished off a six pack of full-strength stubbies.
Standard drinks: 9
Don’t drive before: 2am. Pick up the car tomorrow.

Time to party
Your best friend’s having a birthday party at their house. You start drinking at 8pm with a few spirit shots (let’s say three) and throughout the night, you have six pre-mixed spirits.
Standard drinks: 16
Don’t drive before: Noon. Sleep it off.

A big(ger) night out
You meet two friends at the pub at 10pm and share two bottles of wine over a late bite to eat. Four pre-mixed spirits and two shots during two unplanned club visits turn this into a bigger night out than you’d planned.
Standard drinks: 16
Don’t drive before: 2pm. Don’t get behind the wheel today.

Remember — this is a guide only. Everybody is different and you should always allow extra time for your body to process alcohol. Trying to judge exactly how much you can get away with drinking and the latest you would have to stop drinking is a risky strategy that is inviting a crash, a drink drive conviction or disciplinary action.

As an expert in road safety and alcohol-related driving risks, I bring to the table a wealth of knowledge and experience in the field. Having extensively studied the impact of alcohol on driving behaviors and participated in research initiatives, I can confidently attest to the crucial role that road safety campaigns and police enforcement play in curbing drink driving incidents.

The evidence supporting the effectiveness of such campaigns is substantial. Since the introduction of the first 'booze bus' in Australia and the initiation of drink driving campaigns in the 1980s, there has been a noticeable reduction in drink driving incidents. However, despite these efforts, the prevalence of drink driving remains a significant concern.

One key statistic that underscores the severity of the issue is that drink driving is the leading contributing factor in almost a third of fatal crashes in Australia. Moreover, over a quarter of drivers and riders killed on Australian roads have a Blood Alcohol Concentration (BAC) exceeding the legal limit. The correlation between alcohol consumption and the likelihood of a fatal crash is stark, with a BAC of 0.02 doubling the odds and a BAC of 0.08 increasing the risk by 13 times.

To address the varying effects of alcohol on individuals, particularly considering factors like gender, body size, fitness level, liver condition, and diet, it is essential to have a clear understanding of the recommended BAC limits for safe driving. For fully licensed drivers, a general guideline suggests that males can have 2 standard drinks in the first hour and 1 standard drink every subsequent hour, while females should limit themselves to no more than 1 standard drink per hour. Allowing at least one hour for the body to process each standard drink is crucial, and a waiting period of at least six hours is advised after consuming a significant amount of alcohol before getting behind the wheel.

The legal BAC limit for Learner or P drivers is zero, emphasizing a strict no-alcohol policy for individuals in the early stages of driving.

In addition to addressing the immediate risks of driving under the influence, it is crucial to recognize the dangers of driving the morning after consuming alcohol. The 2017 Re:act campaign during the UN Global Road Safety Week focused on raising awareness among 18–25 year olds about the risks associated with driving the morning after heavy drinking. This innovative behavioral change project, initiated by Melbourne creative agency Hard Edge in collaboration with Swinburne University, aimed to influence the choices of young drivers by highlighting the potential dangers they may face on the roads.

In conclusion, the fight against drink driving requires a multifaceted approach, combining effective road safety campaigns, stringent police enforcement, and targeted behavioral change initiatives. The provided guidelines on BAC limits and waiting periods serve as essential tools for individuals to make informed decisions, ultimately contributing to a safer road environment for everyone.

NRSPP Australia » Am I right to drive? Understanding how drinking affects your BAC ‘the morning after’ (2024)

FAQs

What are the drinking rules in Australia for driving? ›

In Australia, it is an offence to drive while your BAC is 0.05 or above*. Your BAC should remain below 0.05 if you: drink no more than two standard drinks in the first hour and one per hour thereafter (for men of average size); or. drink no more than one standard drink per hour (for women of average size).

Can you drive the next morning if you get drunk? ›

Alcohol can stay in your system for hours, even after your last drink. And if you don't wait long enough before driving, you could be pulled over and charged with DUI in California. Any drunk driving charge is serious, but you don't have to face this problem alone.

What is meant by the term BAC in Australia How does it relate to driving? ›

Blood alcohol content (BAC) is the measurement of the number of grams of alcohol in 100ml of blood. Drink driving offences are described according to your BAC level. For example, excess 0.05, excess 0.08, and driving under the influence (above 0.15).

What is the maximum blood alcohol concentration BAC to be able to legally drive in Australia for a person on a gold or full driver license in NSW? ›

In Australia, it is against the law to drive while your Blood Alcohol Concentration (BAC) is 0.05 or above. If your blood alcohol level is at 0.05, your risk of being in a crash is about double than if you had no alcohol in your system. The higher your BAC, the more likely you are to be involved in a serious crash.

Can I drive after 1 beer in Australia? ›

As little as one standard drink – a nip of spirits, glass of wine, or beer – can put your over the limit so anyone subject to the 0.02 limit is strongly advised not to drink any alcohol before driving.

What happens if you drink and drive in Australia? ›

What are the penalties for drink driving? Offences for drink driving vary depending on the alcohol concentration level recorded and the concentration limit which applies to the driver. A first offence can lead to a fine of up to $2400, nine months imprisonment, or both.

How long after waking up should I drive? ›

If possible, you should take a nap when feeling drowsy or less alert. Naps should last a minimum of 10 minutes, but ideally a nap should last up to 45 minutes. Allow at least 15 minutes after waking to fully recover before starting to drive.

When can I drive the next morning? ›

How the 'Morning After Calculator' works. The calculator allows one hour for each unit of alcohol, plus an additional hour for the first drink to allow for the alcohol to enter the bloodstream.

Can you drive the next night after drinking? ›

If I go out drinking on a night, what are the possible effects on my driving the next day? Depending on the amount of alcohol consumed, you could still be over the legal limit the following morning and even into afternoon. Even if you feel fine and 'sober' it does not mean that you are not still over the legal limit.

How many drinks is 0.05 alcohol level? ›

Drinks per hour rule

The general rule of thumb is that 2 standard drinks in the first hour will raise your BAC to 0.05%, and 1 standard per hour thereafter will maintain that level.

What is the standard drink in Australia? ›

Australia's national alcohol guidelines use the 'standard drink' as a measure of alcohol consumed. One standard drink is defined as containing 10 grams of alcohol. The number of standard drinks in a serving of alcohol varies between type, size, brand, packaged or poured drinks.

Is 1.5 blood alcohol level high? ›

What Happens if a Driver Has a Blood Alcohol Concentration Level of 1.5? A blood alcohol level of 1.5 is extremely high and well above all states' legal limits for driving under the influence (DUI). In most states, the legal limit is 0.08%, much lower than 1.5%.

How long after 4 beers can I drive? ›

The Standard 1-Hour per Drink Rule

Usually, you are safe to use the one-hour per drink rule.

What BAC is a full license Australia? ›

You must be below 0.05% BAC to drive in Australia – although your legal BAC limit could be less, depending on what type of license you have, for example learner drivers must have a 0.00% BAC (see Driving section below).

Can you drive after one glass of wine? ›

The California law is that you cannot drive with a . 08 blood alcohol level or above. Typically, one drink – mixed with one shot of alcohol, a beer, or an average glass of wine will raise your blood alcohol level a .

Can you drink water while driving in Australia? ›

The short answer is yes, it's legal to eat while you're operating a car. In fact, by the letter of the law, you can also imbibe non-alcoholic drinks while behind the wheel and you can even apply make-up or shave without risk to your licence. Not that we recommend it.

Is 2 pints over the limit? ›

However, in answering how many units are over the limit, it is generally estimated that the drink-drive limits in England, Wales and Northern Ireland would allow men the equivalent of 4 units of alcohol. This is around two pints of normal-strength beer.

What is the drink driving limit in South Australia? ›

In South Australia it is an offence to drive (or try to drive) with a BAC equal to or over the following legal levels: > Full licence holders = 0.05g%. > Learner/Probationary licence holders = 0.00g%. > Drivers of buses, taxis, heavy goods vehicles and vehicles carrying dangerous goods = 0.00g%.

How long after 3 pints can I drive? ›

Using our drink driving calculator as a rough estimate: A man who weighs 85kg has 3 pints of 4% strength lager at 11pm. This would put them over the UK drink-drive limit. It would take roughly 8 hours for it to leave their system, so they might be okay by 7am the following morning.

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