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I know several real, honest to God traffic engineers very well, and all I can say is they are even more peculiar than other engineers(from a Real Estate guy point of view), and they have a have accepted a mission from on high to control traffic and therefore save lives. They have a bible too, it's called the MUCTD(manual of uniform traffic devices), and to them it is gospel. If you have questions about that stuff, always refer back to this. Check out the 2003 FHWA edition, they all follow it. Chapter 4 covers traffic signals in excruciating detail.
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