It’s strange to imagine a world without traffic lights, as they have now become a necessity in keeping our busy roads safe and less chaotic. Before traffic lights, police controlled the flow of traffic using hand signals. The world’s first traffic light was installed in London in December 1868. It as a gas-lit signal operated manually by a policeman. Unfortunately this model had limited success, as less than a month later it exploded after it was implemented, injuring its operator. The more modern electric traffic light was developed in 1912…