The world's first traffic signal was installed in London in 1868, using gas-lit red and green lamps to control horse carriages. Though it exploded and injured a policeman after just one month, it pioneered modern traffic control systems and urban safety standards. Keywords embedded: gas-lit, traffic signal, horse carriages, London 1868, urban safety | The History Page

Traffic lights save lives, but do you know how they work? 🚦🤔 #engineering | Interesting Engineering