Manholes are an essential yet overlooked part of urban infrastructure. They provide access to the underground systems that are important for maintaining the flow of water, sewage, and electrical ...

Wander down a busy street in any large city, and you'll likely see them: manholes. They're pretty ubiquitous, spaced at regular intervals along the road. Manholes, which are increasingly termed ...

When walking down the street, you probably don’t stop to notice the manholes on the road. And if you have, you may not have realized that nearly all of them are round—or that those with other shapes ...