I’ve always wondered. The reigning theory as a kid was so that planes could see the line and not fly into it. In adulthood, we realized: planes really don’t fly that low ever.
In: Physics
I asked my parents this question when on vacation as a child. They responded that those “balls on the power lines” were actually “floats” and were there to make sure the power lines didn’t sink when the road flooded. I can’t describe my internal panic as I imagined how very high the flood would have to be to reach that height. (We lived on the Gulf coast, and I saw numerous hurricanes and floods as a child) Yeah, my folks were mean.
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