

1,686,757
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
5,737,692
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
797,169
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
6,947,179
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
1,566,790
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
1,886,388
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
3,988,194
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
3,986,579
Because al the MAN HOLES are round!!!
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Mary Yonkers
Erie, PA
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Debe Maxwell, CRS
Charlotte, NC
1,774,868
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
1,231,903
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
1,466,267
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
948,239
5,712,140
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
8,428,238
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
5,573,184
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
3,417,825
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
3,075,667
4,323,400
David Martin - well, Thomas J. Nelson, Realtor,CRS,e-Pro got it!
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Mary Yonkers
Erie, PA
491,243
Thanks for the trivia Thomas J. Nelson, Realtor,CRS,e-Pro & David Martin.
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Mary Yonkers
Erie, PA
4,434,277
2,743,575
1,713,581
2,275,984
411,987
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
5,774,279
Thomas J. Nelson, Realtor,CRS,e-Pro has the answer. A
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Mary Yonkers
Erie, PA
5,277,454
6,195,843
5,434,719
Sorry no I do not know but sure it must have something to do with real estate.
809,308
4,538,459
David Martin Good to know that Thomas J. Nelson, Realtor,CRS,e-Pro has the right answer.
1,025,253
2,820,240
So it won't fall through. I think this is in one of those books like "When do fish sleep?"