The San Fransicso Chronicle is reporting that railway operators in Japan are installing blue LED lights at stations to deter suicides. While there is no scientific proof that the changes will stop someone bent on killing his or her self, the agencies note that blue lights do have a calming affect on people.
Of course that raises the question of Metro's recent decision to install red LED lights at the edge of platforms. Red is typically a color associated with aggression. WMATA installed the lights in an effort to encourage passengers to stay back from the platform edge.
H/T: The Transit Wire