That's the sign for robot prostitutes.
Yeah, right. As if the sight of the color blue is going to make some guy who's about to mug an old lady suddenly change his mind ...
How It Worked:
Oh, wait, it totally did. The Tokyo prefectures where the blue lights were installed saw a 9 percent decrease in crime. You can write that off to a statistical anomaly if you want (maybe that was the same month they also brought on the RoboCops), but Glasgow, Scotland, saw the exact same result. Glasgow wasn't trying to bring down crime when they installed theirs, they just thought it would make the city look better. Then somebody noticed that crime had gone down right after, and the only thing they had changed was the stupid blue lights.
And piped in some smooth jazz.
Next, the Tokyo railroad decided to get in on the blue-light action, though the problem they wanted to solve wasn't so much the crime. Their main concern was the train-assisted suicides that were taking place in their stations. The result after the blue lights were installed? Suicides dropped down to zero.
Seriously? What the hell?