What is the drink-driving alcohol limit in Northern Ireland?

Those are legal evidential limits, not a safe-drinking allowance. nidirect stresses that alcohol affects judgement and reaction time before a driver necessarily feels drunk, and there is no reliable way to convert the legal limit into a fixed number of drinks for every person.

Body size, sex, food, time, medication and the amount and speed of drinking all affect alcohol concentration. The safest driving plan is therefore zero alcohol if you are going to drive.

The same limit can still catch someone the next morning. Sleep, coffee, food and cold showers do not remove alcohol from the bloodstream; only time does.

The NI enforcement process separates screening from evidential proof. A roadside breath test, DrugWipe or impairment check gives police information and may justify arrest or further testing, but the prosecution is built from the statutory evidential procedure, officer observations and any laboratory or approved-device result. That distinction matters when reading reports of someone having “failed a roadside test”. For an NI application, the key result is that the Northern Ireland drink-drive limit is 35 microgrammes of alcohol per 100ml of breath, 80mg per 100ml of blood, or 107mg per 100ml of urine. The safest NI approach is to verify the current DVA, DfI, PSNI, DVLA or HMRC record that governs the point before acting.