Where does this come from, and can I check it?

The 1968 Vienna Convention fixed shapes so signs read without language. The figure is taken from UNESCO, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a everyday life fact?

Yes. It sits on the Everyday Life shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

Warning signs are triangles with a red border

The 1968 Vienna Convention fixed shapes so signs read without language The Vienna Convention on Road Signs and Signals, agreed in 1968, assigned triangles pointing up to warnings, circles to prohibitions and rectangles to information. Britain, which did not sign, uses the same triangle for warnings but a different set of pictograms. Shape carries the message first, colour second, and the symbol only refines it. It sits in Mondo's everyday life collection, one of 200 facts that each trace back to the reference below.

Where this comes from

UNESCO

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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American street name signs are usually greenRetroreflective green plates became the federal guidance for intersections Red circle signs forbid an action outrightISO 3864 reserves the slashed circle for conduct that is not allowed The green running man sign is a Japanese designA late 1970s competition produced the pictogram now used on emergency exits Zebra crossings are marked by flashing orange globesThe striped poles carry beacons named after a 1930s transport minister Traffic roundabouts improve safety by requiring entering cars to yieldPriority rules inside circular junctions drastically reduce severe crossroad collisions Flexible plastic traffic cones were invented by Charles Scanlon in 1940Stackable hollow rubber cones replaced wooden barricades to protect road workers

Tags: signage, roads, standards

Warning signs are triangles with a red border: the short answers

Where does this come from, and can I check it?: The 1968 Vienna Convention fixed shapes so signs read without language. The figure is taken from UNESCO, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a everyday life fact?: Yes. It sits on the Everyday Life shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.