AircraftPortugal
Traffic rules
Portugal
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 Portugal?
Sign A21, pista de aviação, warns that aircraft taking off or landing at a nearby runway may fly over the road at low altitude.
Warning for low-flying aircraft.
English • Traffic sign A21 • Airfield. Warns of a location where aircraft taking off or landing at a nearby runway may fly low over the road.
Português • A21 • Pista de aviação. Indicação da aproximação de um local em que a via pode ser sobrevoada, a baixa altitude, por aviões que tenham descolado ou que vão aterrar numa pista próxima.
Sources
🔗 Commons.wikimedia.org (Gigillo83 • CC BY-SA 4.0)
🔗 Diariodarepublica.pt • Regulamento de Sinalização do Trânsito • artigo 19.º • A21
🔗 Ansr.pt • Republicação oficial retificada • A21 • página 11
SVG source: Gigillo83 • CC BY-SA 4.0 • Original revision 2015-03-17. Wikimedia original unmodified.
Does an aircraft warning automatically reduce the speed limit in Portugal?
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 Portugal?
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.
