Must every window be clear of ice before driving in Northern Ireland?

You must have a clear view to drive safely; in winter that means clearing the windows you need for proper all-round visibility rather than leaving them obscured by ice.

The Highway Code specifically says to clear all snow and ice from windows before setting off and to demist thoroughly.

For “Must every window be clear of ice before driving in Northern Ireland?”, the wider Northern Ireland context is this: Northern Ireland winter driving is especially sensitive to changing road-surface temperature, rain, ice, flooding and exposed routes. Official advice is to drive for the conditions actually in front of you, not for the posted speed limit or the fact that a road was treated earlier. TrafficWatchNI and current weather warnings are the right live sources when conditions are deteriorating.

For this exact question — “Must every window be clear of ice before driving in Northern Ireland?” — the practical point is: Also clear mirrors and check that wipers are not frozen to the glass. 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 “Must every window be clear of ice before driving 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.