Just as with the English-speaking world, Japan uses red and green lights to indicate “stop” and “go”. However, the Japanese language does not use those terms. They call the red light 赤い（red）and the green light 青い (blue) even though it’s actually green. I do not know the historic reason behind this, but I suspect that this may be bleed over from Chinese.
|Akai Shingō||Aoi Shingō|
|Red Signal||Blue Signal|