We’ve all heard the warnings: don’t drink and drive. Yet the real confusion often begins the morning after. You might feel fine, but are you actually under the legal limit? The truth is, when it comes to alcohol and driving, feeling okay doesn’t mean you’re in the clear.
In Australia, drink driving is still one of the biggest causes of fatal crashes. Around a third of deadly accidents involve alcohol, with many drivers over the legal blood alcohol concentration (BAC) limit. And what’s worrying is that many of these drivers believed they were safe to drive.
What Are the Legal Limits?
For full licence holders in most states, the legal BAC limit is 0.05. But for learner and provisional (P1 and P2) drivers, the limit is strict — zero. That means you must not have any alcohol in your system at all.
You might think, “I only had a few drinks, I’ll be fine in the morning.” That’s where things get tricky. Alcohol lingers in your system long after your last drink, and sleep doesn’t speed up the process.
How Long Does It Take for Alcohol to Leave Your System?
The rough guide is that your liver processes about one standard drink per hour. But this is just a general estimate. How fast your body gets rid of alcohol depends on many things: your size, gender, fitness level, how much you’ve eaten, and even your stress levels.
Let’s say you had six standard drinks over a night out. You’d need at least six hours from your last drink for your body to process that alcohol — and that’s under perfect conditions. For many people, it takes longer.
Women usually take more time than men to process alcohol. This is partly due to body composition, hormones, and liver development (which doesn’t fully finish until about age 21). So if you’re a young female P-plater, you may need to wait much longer than you think.
READ MORE: All about traffic rules and road signs in Australia
Real-Life Examples
Here are some typical drinking scenarios and how long you’d need to wait before it’s safe to drive:
1. Dinner and drinks
You go to a mate’s house at 7 pm and finish two bottles of wine by 11:30 pm.
That’s around 15 standard drinks.
You shouldn’t drive before 10:30 am the next day — and only if you’ve slept well.
2. A casual six-pack
You knock off work and start drinking at 5 pm. By 9 pm, the six-pack is gone.
That’s around 9 standard drinks.
Your safest bet? Don’t drive until at least 2 am.
3. Party night
A birthday bash sees you having three shots, six pre-mixed spirits, and some snacks.
Around 16 standard drinks.
You’re not safe to drive until noon or later the next day.
4. Huge night out
Late pub dinner, shared wine, clubbing with shots and spirits.
Still about 16 standard drinks.
Don’t drive before 2 pm the next day — or better, give yourself the whole day off.
Why You Can’t Trust “Drink Counting”
Many people still go by the old rule: “2 drinks in the first hour, then 1 every hour after.” That’s outdated and unreliable. It assumes you’re a fully grown, healthy man with a functioning liver. It doesn’t apply to women, young drivers, or anyone who isn’t exactly average.
Even if you follow the “one drink per hour” idea, alcohol can behave unpredictably in your system. Medications, sleep, stress, or food can all affect how quickly your body breaks it down.
The only way to be absolutely sure is to give your body time — lots of it.
The Morning After Trap
Here’s where many get caught: they stop drinking at midnight, go to bed at 2 am, wake up at 7 am and think they’re good to go. But if you had more than a few drinks, you probably aren’t.
Take this example: A 19-year-old woman drinks nine standard drinks and goes to bed at 2 am. She doesn’t return to a 0.00 BAC until 18 hours later. That means she couldn’t safely drive until 8 pm the next day.
P-platers with a 0.00 BAC requirement are especially at risk. Even one or two drinks the night before can lead to a breach of the limit if you drive too early.
Better Safe Than Sorry
There’s no magic number or formula to tell you when it’s safe to drive. Everyone processes alcohol differently. If your night was heavier than usual, assume you shouldn’t drive at all the next day.
Had just one or two drinks? Wait at least 12 hours from when you went to bed before driving.
And if you feel off — tired, foggy, nauseous — don’t risk it. That’s your body telling you alcohol is still hanging around.
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Final Thoughts
In the end, the safest choice is always to wait—sometimes longer than you think—before getting behind the wheel after drinking. Alcohol affects everyone differently, and even if you feel fine, your blood alcohol level might still be above the legal limit. For P-platers and young drivers, the zero-tolerance rule means there’s really no room for risk.
When it comes to drink driving, patience is your best friend. So, plan ahead, give yourself plenty of time, and choose safety every time. After all, no drink is worth losing your licence—or worse.
FAQs
Q: Can I speed up how fast my body processes alcohol?
A: Nope. Cold showers, coffee, or greasy breakfasts don’t help. Only time works.
Q: Is it true that women take longer to process alcohol?
A: Yes. Hormones, body size, and metabolism all play a part. Women (especially under 21) often need longer to reach 0.00 BAC.
Q: What if I vomit after drinking? Does that mean I’m sober?
A: No. Throwing up doesn’t remove alcohol already absorbed into your bloodstream. You still need to wait.
Q: I felt fine the next morning, but still failed a breath test. How?
A: Feeling okay doesn’t mean you’re under the limit. BAC is about how much alcohol is still in your blood — not how drunk you feel.
Q: Can breathalysers from chemists or online stores be trusted?
A: Some personal breathalysers can be useful, but they’re not always accurate. Unless it’s a high-quality, calibrated device, don’t rely on it to make driving decisions.
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