Because there are no angles for alignment, the round shape makes these
heavy covers easier to put back on once they're taken off. Round covers
are also easier to manufacture. But the main reason manhole covers are
round is so they won't accidentally fall into the subterranean abyss.
With a round cover, no matter how you hold it, you can't shove it in. It
just won't go. If it were square, a prankster could hold the cover
diagonally over the hole and drop it in, to be followed by who knows how
many scooters and pedestrians.
Why Are Manhole Covers Round?
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