Who has priority when two lanes merge into one in Northern Ireland?

Neither driver should force priority when two lanes merge; follow signs and markings and merge safely into the available gap.

Where traffic is slow and lanes are directed to merge, the Highway Code concept of merge in turn can help use road space efficiently. At higher speeds, plan the merge earlier.

For “Who has priority when two lanes merge into one in Northern Ireland?”, the wider Northern Ireland context is this: Northern Ireland's Highway Code uses signs, signals and road markings together, so the safest reading is always the exact sign at the location plus any lane arrows, plates or temporary traffic management. Rules expressed as ‘must’ or ‘must not’ are legal requirements; advisory wording can still be used as evidence when responsibility for a collision is considered.

For this exact question — “Who has priority when two lanes merge into one in Northern Ireland?” — the practical point is: Match speed, signal where useful and avoid accelerating to block another vehicle from joining. The answer should be applied to the actual signs, conditions, licence wording or parking rules in force at the time, because temporary restrictions and individual DVA decisions can change the ordinary position.

This Northern Ireland-specific page on “Who has priority when two lanes merge into one in Northern Ireland?” was checked against the attached official sources before publication, with nidirect/DVA and the Northern Ireland Highway Code used ahead of generic UK motoring articles. If the rule, road layout or personal licence condition changes, those primary sources are the ones to re-check.