Who invented traffic lights?
The person who invented the traffic lights was J.P.Knight. He was a railway engineer born in January 13. 1828. He invented the traffic lights when were killed on roads in London. His lights were lanterns powered with gas and had a red and a green light. Read more on http://www.theguardian.com/notesandqueries/query/0,5753,-1460,00.html.
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