How does alcohol affect your driving? How to use the calculator. However, there may be people who have imbibed say a pint of beer and are wondering if they can drink and then drive. If you drink, don't drive period, no matter how much you have had. Certain groups are more likely to drink and drive than others. Unlike charts, calculators, or rules, BACtrack Breathalyzers don’t use generalizations–they use your breath to estimate your BAC. (Picture: Getty) Unfortunately, the measurements for how much you can drink are given by law in a way that doesn’t make a lot of sense to the normal person on the street. Drink driving limits in Ireland: How soon can you drive after pints, wine and shorts at Christmas “This is a relatively new and unregulated space. If you have been drinking, call a taxi, a friend or family member to come to pick you up. If you think you're good to drive, you're probably not. No matter the circumstances, you should never drink and drive. How Much Alcohol Can You Drink Safely? But this impression is deceptive. Just stay where you are until you sleep it off. The 'hours before driving' calculation is not based on any drink drive limit - it is the length of time when the alcohol in the drinks you've consumed is likely to have passed through your body. People who drink and drive put everyone on the road in danger. Want to know how much you can drink under the new laws? Because in the body, alcohol acts like an anesthetic. ... You can’t experiment by randomly assigning groups of people to drive drunk or sober for a year. It’s not worth the risk of putting yourself and others in danger. This is when we suggest you will be 'safe to drive'. Research also shows that the severity of life-threatening motor vehicle accidents increases significantly at BACs far lower than the current U.S. limit of 0.08. The drink driving element of the bill does not change the parameters for drink-driving in Ireland, the limits remain the same but it does change the penalty. Here’s an example of how your BAC level affects your driving: BAC of 0.02. You can be impaired and arrested even if your BAC is under 0.08%. No other method is quite so fast, convenient and reliable. Many people think that they can still drive after a glass of wine or two bottles of beer. For three nights in a row, Laura Walters went to the pub to find out. You should never drink and drive, no matter how much you’ve consumed. Plan ahead and always designate a sober driver before the event begins. From as little as 0.2 per mille on, you can see worse and steer less easily. Men were responsible for 4 in 5 episodes (81%) of drinking and driving in 2010. Illustration by Celia Jacobs. You can easily go over the limit if that drink or two is bigger than you realize. 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