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Japanese traffic signals mostly follow the same rule except that the "go" signals are referred to as 青 (blue), which they historically were in fact, but this caused complications with the international "green for go" rule, so [47] in 1973 a decree was issued that the "go" light should be changed to the bluest possible hue of green, thus making it factually greener without having to change the name from 青(blue) to 緑(green).