00:00 - Who invented the traffic light and why?
00:41 - What was the first city in the world to have a traffic light?
01:15 - Are traffic lights the same in all countries?
01:46 - How did the first traffic light work?
02:20 - Who invented stop signs?
Laura S. Harris (2021, February 21.) Who invented the traffic light and why?
AskAbout.video/articles/Who-invented-the-traffic-light-and-why-221044
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