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Four sign families told apart by outline before colour.
Also known as: Japanese sign families, Japanese road sign classification
The Japanese convention assigning each class of road sign its own outline — a yellow diamond for warning, a circle for regulation, a blue square for instruction, a blue or green rectangle for guidance.
Divides Japanese road signs into warning, regulatory, instruction and guide families, each with its own outline.
Contexts: Road signage
Puts Japan on the North American side of the warning-sign divide and the Vienna side of the regulatory one: the warning family is a yellow diamond as in the United States, while regulation is carried on a circle as in Europe. Neighbouring Korea and China use the Vienna triangle for warning, so the three countries differ on the same family.
Contexts: Road signage
Four outlines used by class: a square stood on one corner as a diamond for warning, a circle for regulation, a square for instruction, and a wide rectangle for guidance.
The neighbouring national scheme that resolves the same problem the other way.