it will always fit securely on top of the manhole. Contrastingly, if the cover were square or rectangular, it could be turned in such a way that its diagonal would be smaller than the sides of the ...

Being circular also makes them easier to transport, as you can roll them along their edge, and square manhole covers have a larger surface area when made to the same width as a circular manhole ...

Major League Baseball will celebrate the league’s 12 active Japanese players through custom manholes that will feature one player in each design, to be installed at locations associated with that ...

Manhole covers are designed to stay in place, with their round shape preventing them from falling in. But they can become ...

Another notable answer to this question — an answer that shows up consistently on internet searches — is that a round manhole cover, unlike a square one, will not fall back through its opening ...