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White lettering on red, marking a boundary not to be crossed.
Also known as: Red aerodrome sign, Holding position sign
A red aerodrome sign with white lettering marks a boundary an aircraft may not cross without clearance — a runway holding position or a critical area. Red is reserved for this class, so its colour alone identifies the instruction before the legend is read.
Marks a location beyond which an aircraft may not proceed without air traffic clearance, lettered white on red.
Contexts: Public information, Navigation
Reserves red for mandatory instructions, so no other class of aerodrome sign uses it and the colour identifies the class at a distance.
Contexts: Public information, Navigation
A rectangular panel with a red field carrying white capital letters and numerals.