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A red-bordered upward triangle carrying a hazard pictogram.
Also known as: Danger triangle, Warning sign shape
Under the Vienna Convention every warning sign is an upward-pointing triangle with a red border, and the pictogram inside says what the hazard is. Shape carries the class and the pictogram carries the detail, which is why the signs are readable without language.
Marks a warning under the Vienna Convention, the upward triangle and red border identifying the class of sign before the pictogram is read.
Contexts: Road signage
Separates class from content deliberately, so that a driver knows a sign is a warning at a distance and learns what kind on approach.
Contexts: Road signage
Is replaced in the United States by a yellow diamond, so a driver crossing between the two systems must relearn the shape that means warning.
Contexts: Road signage
A triangle standing on its base with a broad red border and a pictogram in black on a pale field.