The drink-drive limit will be lowered under new road safety legislation planned for this autumn in England and Wales.
The limit will be cut from 35 to 22 micrograms of alcohol per millilitre of breath, following the same move in Scotland in 2014, The Times has reported.
Health officials no longer equate breath or blood alcohol levels to how many drinks it would take to reach that level, as it varies from person to person.
There have long been calls for the rest of the UK to match its drink-drive limits with those of Scotland, in an effort to reduce the 300 UK deaths a year involving a driver over the legal limit.
While the change may leave people wondering how much they can now drink before driving, campaigners and health experts have said the only safe option is for people to