It is known that Japan has one of the highest suicide levels in the world. Many suicides in this country are committed as an atonement for the mistake, which brought shame or caused damage to the family, friends, etc. Also, Japanese people get depressed when losing their job (in the older age they feel emptiness upon retirement), which pushes them to reckless actions. It prompts the government to increase the allocation of funds to prevent people from killing themselves.

One of the ways to reduce suicide level is to establish blue lights in a metropolitan area. Railway companies state that installing blue lamps is much cheaper than providing screen doors of each platform. The cold color prevents desperate passengers from throwing themselves under the train. An observational decade study from the country confirmed the hypothesis: after providing blue lamps, the number of suicides has decreased by 84%.