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Alicorn comments on Calibration fail - Less Wrong
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I've seen them taken down for repairs, and they're much larger than I'd thought, but not 7 feet tall. Maybe 4' IIRC?
The lenses are either 8" or 12" in diameter in the US: http://mutcd.fhwa.dot.gov/htm/2003r1r2/part4/part4d.htm
So if you're looking at 3 8" lenses in a row vertically, the whole thing is at least 3' tall, probably more.
I just looked through hundreds of photos of traffic lights on google, and not one was of the standard yellow US kind that hangs from a wire.
7' traffic signals, if they in fact exist, are probably reserved for intersections where the lights are hung up unusually high or something. I'm skeptical that the kind you see all the time are really seven feet.
Some traffic signals have several (I've seen up to 6) lights for different directions arranged in a vertical column, I'd guess this is what your source was referring to. For some reason these are really hard to find on google images, but here's one.