Drivers are warned they will be taking a risk if they drink any alcohol at all under tougher drink-driving laws.
The Government is planning to cut the drink-driving limit in England and Wales from 35 micrograms of alcohol per 100 millilitres of breath to 22 micrograms.
While there is no exact amount someone can drink and stay below the drink-drive limit due to individual factors like age, weight and metabolism, there is a rough indication.
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The current drink-driving limit is roughly equivalent to three units for women and four units for men.
This could be around two pints of low-strength beer or just over one pint of high-strength beer.