AircraftIreland
1. Aircraft
An aircraft warning is a traffic warning indicating that aircraft may pass at low altitude above or close to the road, usually near an airport, airfield or flight path. The warning is intended to prepare drivers for the sudden appearance or noise of low-flying aircraft.
Drivers should remain focused on the road and avoid sudden braking or steering movements if an aircraft passes overhead. The design and use of aircraft warning signs vary between countries.
What should an aircraft-warning sign tell drivers in Ireland?
Where an aircraft warning is installed, it alerts drivers to low-flying aircraft or sudden aircraft noise near an airfield or flight path. Irish traffic signs follow the national Traffic Signs Manual; interpret any aircraft warning under the local sign system rather than by its colour alone.
Warning for low-flying aircraft.
English • W 165 • Low-flying aircraft. Low-flying aircraft may occur ahead. Do not be distracted by aircraft or sudden noise.
Sources
🔗 Commons.wikimedia.org
🔗 Roadguidelines.ie • Department of Transport • Traffic Signs Manual • W 165
SVG source: Government of Ireland – Department of Transport • Public domain • Original revision 2021-10-24. Wikimedia original unmodified.
Artwork verified against Roadguidelines.ie • official published diagram W 165.
Does an aircraft warning automatically reduce the speed limit in Ireland?
No, not by itself. A hazard warning is not a numerical speed-limit sign. Obey any separately displayed speed restriction and adjust speed if actual conditions make this necessary.
What if a low-flying aircraft distracts you while driving in Ireland?
Keep your eyes on the road, maintain your lane and avoid sudden braking or steering simply to watch the aircraft. If you need to stop, find a safe and permitted stopping place.

Traffic rules
Ireland