The very first traffic light was a cold blooded killer. When it was first put up in 1868, it was installed outside the Houses of Parliament in London, but it only took less than a month before it claimed it's victim. Ironically, it was designed to control traffic to save lives—butthe light suddenly exploded and killedthe traffic cop whose job was to operate the traffic light.
An interesting thing about this first light is that is used the same colors that modern traffic lights use. They inventors of the light borrowed the colours from the rail road system, which used the colours red and green! As to why those colours we're chosen for the rail road, nobody knows. The best guess people have is that red has always sort of been a signal for danger, and green is a colour that calms people.
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