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How does traffic light planning work?

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I'm new to the board and have done some searching around for this, but couldn't find a direct article related to my question. I live in Seattle and find that in some ways the trafic light system makes no sense (to me). So I thought it would be a good thing for me to learn what goes in to it, how difficult a job it is, etc. Anyone have any sites/articles I could read as a primer?

many thanks.

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