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Plain yellow.
Also known as: Caution flag, Double yellow
The signal flag meaning danger ahead: slow down, do not overtake, and be prepared to change direction.
Signals danger ahead: slow down, do not overtake, and be prepared to change direction.
Contexts: Public information
Doubling the flag raises the severity rather than changing the message, so the system encodes degree by repetition — the same device the Indic and Tibetan double punctuation marks use for a different purpose entirely.
Contexts: Public information
A plain yellow rectangular flag, shown singly and waved, or shown as two together for the more serious condition.