Can I turn left at a red traffic light in Northern Ireland?

No general rule allows a driver to turn left through a red traffic light in Northern Ireland.

A red signal means stop. You may move only if a specific signal, such as an applicable green filter arrow, authorises the movement.

For “Can I turn left at a red traffic light 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 — “Can I turn left at a red traffic light in Northern Ireland?” — the practical point is: Do not import the North American “turn on red” rule into Northern Ireland driving; wait for the relevant green indication. 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 “Can I turn left at a red traffic light 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.