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Try working on traffic lights. I can't drive anywhere on the weekends where I don't feel like I'm at work. Even if I get out of town I count the yellow gap and all red time on other localities lights just to compare

Funny you mention that.... First time I came to the U.S. I ended up starting a traffic lights quite a lot, and timing the yellow phase, which in most places seems to be rather longer than in the U.K.

Take a look here , and you'll probably end up mentally running through the wiring possibilities for the different arrangements! [Linked Image]