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Traffic lights are crucial to traffic control.
You can also see the red light sooner than the green light so you can hit the breaks faster.
The Declaration • January 17, 2019 • https://thedeclarationatcoloniahigh.com/36434/fun-factofthe-day/the-average-person-spends-6-months-of-their-life-waiting-for-a-red-light-to-turn-green/
The average person spends 6 months of their life waiting for a red light to turn green.