Quote:
Originally Posted by FireFly
I'm saying that the lights still have to talk to the other lights at the same intersection so they know they aren't all green at the same time... and what's going to control that? It isn't just a battery you need....
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Firefly, I think you are misunderstanding us. We aren't talking about just putting in batteries to power just the light bulbs. We are talking about using battery backup for the traffic control device; the grey box that sits beside every controlled intersection and tells the lights what colour to turn. It has a computer inside that runs switches. (I know because for Y2K some cities had to set theirs back to 1972 because they couldn't switchover in time.) And a computer can run on batteries; as can light bulbs.