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A comment on Reddit and the Struggle to Detoxify the Internet. Parent comment

Re:Reddit and the Struggle to Detoxify the Internet by dragonwriter on Monday March 12, 2018 @10:12PM (#16573428)
> You can easily put a square or a rectangular utility cover into the hole

Then why do rectangular (including square) and triangular manhole covers exist? Rectangular ones are quite common, triangular less so.

Grandparent is correct, lips are what, in practice, prevents manhole covers from falling in, not being circular (which many are not.)

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Re:Reddit and the Struggle to Detoxify the Internet by mulmen on Monday March 12, 2018 @11:06PM (#16573637)
Well maybe in some cases the risk of the lid falling in is acceptable. Or maybe there are other mitigations in place.
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Re:Reddit and the Struggle to Detoxify the Internet by anigbrowl on Tuesday March 13, 2018 @09:59PM (#16581658)
I don't know why rectangular utility holes exist, I assume cost.
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