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Douglas_Knight 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.
Inference: your neighborhood (or your belief about it) is not representative and yellow and/or hanging from a wire is not standard. I was surprised by the diversity of results on google. On the first page, there were no yellow-on-a-pole and just two cantilevered yellow ones. Bing put a cantilevered one first and had a couple on wires[dead] in the top 20. But they weren't yellow! They do seem to be in the US. Maybe traffic lights aren't yellow?
ETA: Bing's "similar images" produced a few yellow lights on wires, but it was still dominated by the familiar green and gray.