The mystery begins with ao, a Japanese word that historically covered both blue and green. Although midori eventually emerged as a distinct term for green, older expressions survived. Green apples and bamboo can still carry names using ao, and traffic signals inherited that same linguistic tradition. Japan’s early “go” lights were green, yet people and official documents called them blue. The mismatch wasn’t a mechanical failure; it was language carrying its history into modern life.
According to Atlas Obscura, a 1973 government decision sought to reconcile the wording with the hardware by choosing the bluest permissible shade of green. That compromise explains why some Japanese signals look turquoise or distinctly bluish while remaining technically green. Their message has not changed: they indicate permission to proceed when safe. For visitors, the surprise offers a reminder that even something as familiar as a traffic light can reflect centuries of cultural memory.
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