[skhr0680]

Can you tell me the location of an actual blue traffic light in Japan?

[roer]

I went ahead and geoguessr'd one of the images of a "blue" traffic light, and came to the following: https://maps.app.goo.gl/EjYmH34YC19y3fVt9

There is another one to the right as well. They look very blue when turned off, but cyan/green when turned on.

[skhr0680]

That color is common in incandescent green traffic lights around the world, not only in Japan. The idea was to use a blue-green lens to make a mostly green light when paired with a yellow lightbulb

[deadbeeves]

The daylight and the contrast with the trees don't help, either.