1,620,111
Physics: a round cover is too big to fall through it's own hole, it's easy to roll away (no lifting) and when replacing it, it goes back without need to line it up.
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Debbie Gartner
White Plains, NY
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Lyn Sims
Schaumburg, IL
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Raj Taj
Lake Bluff, IL
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Sandy Padula & Norm Pa...
, CA
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Mary Yonkers
Erie, PA
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Michael Setunsky
Woodbridge, VA
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Ryan Huggins - Thousan...
Thousand Oaks, CA
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Ron and Alexandra Seigel
Carpinteria, CA
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Debe Maxwell, CRS
Charlotte, NC
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Roy Kelley
Gaithersburg, MD
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Carol Williams
Wenatchee, WA
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Thomas J. Nelson, REAL...
La Jolla, CA
5,487,209
Thomas Nelson has squared up the accurate answer!
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Mary Yonkers
Erie, PA
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Thomas J. Nelson, REAL...
La Jolla, CA
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Debe Maxwell, CRS
Charlotte, NC
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Roy Kelley
Gaithersburg, MD
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Carol Williams
Wenatchee, WA
760,866
It can't fall into the hole.
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Raj Taj
Lake Bluff, IL
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
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Roy Kelley
Gaithersburg, MD
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Carol Williams
Wenatchee, WA
117,135
so they can't fall into the hole, right?
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
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Roy Kelley
Gaithersburg, MD
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Thomas J. Nelson, REAL...
La Jolla, CA
6,691,416
A round pipe has more strength than a square one, so pipes are round, and so are the covers that go over them.
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Bob Crane
Stevens Point, WI
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
1,539,044
DANG! Here I am thinking it had something to do with the shells on the backs of the Teenage Mutant Ninja Turtles. I've been educated by the man, the myth, the knower of things Thomas J. Nelson, Realtor,CRS,e-Pro
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Debe Maxwell, CRS
Charlotte, NC
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Mary Yonkers
Erie, PA
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Thomas J. Nelson, REAL...
La Jolla, CA
1,870,653
No, but do you know how much each one costs? Cast iron ....
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
3,988,138
Pipes are round so the manhole fits better. Most men are round not square.
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
3,986,473
Because al the MAN HOLES are round!!!
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
1,752,137
Because the fly so well when the sewers blow-up?
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
1,231,853
Tell us, please. Of course, we can put " " ditto marks under Thomas J. Nelson, Realtor,CRS,e-Pro
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Tony and Suzanne Marri...
Scottsdale, AZ
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Debe Maxwell, CRS
Charlotte, NC
1,466,257
David Martin Thomas J. Nelson, Realtor,CRS,e-Pro 's answer makes a lot of sense.
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Mary Yonkers
Erie, PA
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Thomas J. Nelson, REAL...
La Jolla, CA
933,368
5,489,132
Yep, square covers could fall through their own hole - round ones don't!
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Lyn Sims
Schaumburg, IL
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Mary Yonkers
Erie, PA
8,155,063
It is smart to have covers that will not fall through the holes.
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
5,315,992
No I don't know... why don't you tell us? Just for fun, of course!
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Mary Yonkers
Erie, PA
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Thomas J. Nelson, REAL...
La Jolla, CA
3,416,372
I would think with a square corners could pop up popping tires, with a circle it is less likely to fall in if loose
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Mary Yonkers
Erie, PA
3,074,389
4,322,035
David Martin - well, Thomas J. Nelson, Realtor,CRS,e-Pro got it!
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Mary Yonkers
Erie, PA
457,940
Thanks for the trivia Thomas J. Nelson, Realtor,CRS,e-Pro & David Martin.
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Mary Yonkers
Erie, PA
4,434,227
2,708,588
1,713,581
2,249,804
395,137
Safety-wise, I am thinking it is so there are no sharp corners that could damage tires. Now I am going to read the other answers and see why...
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Mary Yonkers
Erie, PA
5,774,100
Thomas J. Nelson, Realtor,CRS,e-Pro has the answer. A
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Mary Yonkers
Erie, PA
5,118,818
6,008,017
5,204,383
Sorry no I do not know but sure it must have something to do with real estate.
809,308
4,362,761
David Martin Good to know that Thomas J. Nelson, Realtor,CRS,e-Pro has the right answer.
1,009,628
2,818,727
So it won't fall through. I think this is in one of those books like "When do fish sleep?"