Useful sourced information concerning the history of traffic lights:
https://www.scienceabc.com/innovation/ready-steady-go-the-evolution-of-traffic-lights.html
https://www.motorbiscuit.com/history-of-the-traffic-light/
https://www.inclusivecitymaker.com/1868-2019-a-brief-history-of-traffic-lights/
https://www.idrivesafely.com/defensive-driving/trending/history-and-meaning-colored-traffic-lights
https://www.traffictechnologytoday.com/features/a-complete-history-of-the-traffic-signal.html
https://www.thevintagenews.com/2018/10/05/traffic-light/
https://mocomi.com/facts-about-traffic-lights/
https://www.smithsonianmag.com/innovation/brief-history-stoplight-180968734/
Have fun with electronics....😎
