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Alicorn comments on Calibration fail - Less Wrong
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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.