Why are manholes round instead of square?

“To make them easier to roll away”

While a round shape may be easier to roll, the primary reason for the shape is safety and functionality, not ease of movement.

“Because it's cheaper to manufacture round covers”

The manufacturing cost is not the main consideration; the design is primarily based on structural integrity and safety.

“Round shapes are more aesthetically pleasing”

Aesthetics is not the functional reason; the design choice is based on preventing accidents and ensuring the cover stays in place.