Breathalysers must be able to be fitted into all new cars from 2022 following a landmark decision by the European Council.
The technology, that could prevent drink-drivers from starting their engines, was approved in March but has only just been rubber-stamped by European officials last week.
The UK’s position is yet to be confirmed, but the current Government has previously said it will mirror European road safety rules post-Brexit.
Cars made before 2022 will have to comply with the new rules by 2024. Road safety charity Brake has labelled the move the “biggest leap forward for road safety this century”.