WE all know that driving while drunk is a big no-no.
Getting behind the wheel might not seem like a big deal if you've just had a couple pints.
But different people react to booze in different ways, and just a couple pints can drastically – and sometimes tragically – alter your judgement and behaviour.
While you might feel sober, alcohol slows down your reaction times – chugging water or coffee might not clear your head the way you think it will.
Here, we take a look at what the limits are when it comes to booze and driving.
How long does alcohol stay in your system?
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Drink driving can kill, that's why you should never get behind the wheel if you've had alcohol – no matter how many drinks you've had.
Sometimes it can feel like a hangover lasts two days, and other times you wake up feeling like you didn't drink.
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Neither is a true indication of how much alcohol is actually in your system, however.
The Government sets strict drink drive limits to prevent drink driving deaths, of which there are an estimated 7,800 in the UK every year.
Dr Fiona Sim OBE, chief medical adviser for Drinkaware said the amount of alcohol in your bloodstream depends on three things.
Firstly the amount you consume, secondly, the period of time and finally, the speed at which your body gets rid of it.
Alcohol leaves your body at a rate of about one unit per hour – but this can vary from person to person.
Your size, gender, state of your liver, metabolism, whether you are stressed and how much you've eaten can all affect how quickly or slowly your body can process alcohol.
And there is no test you can take to give you those answers – hence why experts say it's best to avoid the risk of drink driving entirely.
Can I sleep alcohol off?
People often wrongly assume that the effects of alcohol wear off as you sleep, even if you have a fuzzy head in the morning.
But sleep has no bearing on the rate at which alcohol leaves your bloodstream.
Research by the Institute of Advance Motoring suggests that people don't understand that just because they've been to sleep, it doesn't mean they are no longer affected by alcohol.
It states: "Many drivers who would not consider driving after a night in the pub fail to recognise the influence of alcohol on their body the next day, or simply choose to ignore its effects."
Can I drink coffee or water to speed it up?
There's nothing you can do to speed up the rate that alcohol leaves your system, Drinkaware warns.
The leading charity said: "Having a cup of coffee or a cold shower won’t do anything to get rid of the alcohol.
"You might feel slightly different, but you won’t have eliminated the alcohol in any way.
"The only way to eliminate alcohol from the body is to let time pass."
Meanwhile drinking coffee might help wake you up, and water will help to rehydrate you – both of which are useful for a hangover.
But neither of these changes the fundamental amount of alcohol in your body.
This goes for the night before, too.
Drinking a pint of water before bed might alleviate your headache the next morning, but it won't change the level of alcohol in your system.
How many units are in an alcoholic drink?
The number of units in an alcoholic drink can vary, depending on the strength of each individual brand.
But roughly, these are the units in popular drinks:
- 175 ml glass of average strength wine (12%) = 2.1 units
- 250 ml glass of wine of average strength (12%) = 3 units
- Single measure of spirits = 1 unit
- Pint of high strength lager, beer or cider (5.2%) = 3 units
- Pint of low strength lager, beer or cider (3.6%) = 2 units
What is the drink-driving limit in the UK?
Government guidelines state that the limit in England, Wales and Northern Ireland is 80 milligrammes of alcohol per 100 millilitres of blood, 35 microgrammes per 100 millilitres of breath or 107 milligrammes per 100 millilitres of urine.
In Scotland, the limits are 50 milligrammes of alcohol per 100 millilitres of blood, 22 microgrammes per 100 millilitres of breath or 67 milligrammes per 100 millilitres of urine.
There is no way of knowing how many milligrammes one unit of alcohol will produce in your bloodstream.
How much can I legally drink?
The Government says it is "impossible" to say how many drinks are safe to avoid going over the limit, based on the fact everybody is different.
But the evidence is clear – that drinking impairs your ability to drive.
As a rule of thumb, two pints of regular-strength lager or two small glasses of wine would put you over the limit.
But this isn’t a catch-all rule.
As explained, factors like weight, sex, metabolism and how much you’ve eaten all contribute to how your body processes alcohol, so everyone has different limits.
There is no fool-proof way of drinking and staying under the limit.
Many people have a one-drink limit but there is no way of proving whether this is too much or too little.
What if I need to drive the morning after drinking?
Advice on Drinkaware states that even in small amounts of alcohol can affect your ability to drive, and there is no fool-proof way to drink and stay within the limit.
Guidance states: "The advice from the police is clear: avoid alcohol altogether if you plan to drive.
"Because there is no way to speed up how long your body takes to process any alcohol in your system, there’s no fail-safe way to guarantee all the alcohol you have drunk will be gone by the time you wake up the next day."
There are tools available to calculate the units in your favourite tipple at Drinkaware.com.
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It also has an app you can download to keep track of your units on a night out.
If you really want to make sure you are safe to drive, you could use a home breathalyser like the ones sold by Alcosense before you take to the roads.
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