In the UK we have red, amber and green, while here in Japan they have red, yellow and blue, even though a ‘blue’ traffic light is the same colour in both countries. So when I saw these temporary lights at a set of roadworks, I thought to myself that it might be an in-joke on the part of whichever Japanese company manufactured them.
‘OK,’ they seemed to be saying, ‘if you’re going to take the mickey out of us for calling a green traffic light blue, cop this! A proper blue traffic light! So there!’
And who can argue with that?