W351
At a glance
- Sign code
- W351
- Type
- Warning
- Official meaning
- Warning sign indicating a section of road where low-flying aircraft may be encountered.
What the Low flying aircraft ahead sign means
Warns that low-flying aircraft cross or operate over the road ahead, often near an airfield, and their noise or sudden appearance may startle you.
What you must do
Stay alert, keep your eyes on the road, do not be distracted by aircraft overhead, and be ready for other drivers who may slow or react suddenly.
Know the mistake this sign turns on
Full access adds the confusion Low flying aircraft ahead is most often mistaken for and the hint for the test, on this sign and every other one — plus practice questions and timed mock papers. The practice sample and the readiness test are free.
See the free practice testSources
- Road Traffic Signs chart, National Department of TransportThe official chart. Sign W351 was checked against it, artwork and meaning, before being published here.
- National Road Traffic Regulations, 2000 — Schedule 1Where the prescribed meaning of each road traffic sign is set out.
Last updated 2026-08-23.