That’s actually a great question!!
Traffic lights help the flow of traffic only if they are properly tuned.
It’s not really a matter of number but location and timing.
One thing that I can tell you is that a lot of research is done at the moment to find ways to remove them completely! One side of this research focuses on changing people behaviour at the intersections; the other covers the fact that if you have connected autonomous vehicles, they can talk with each other and coordinate without the traffic light.
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