Engineers determine how many layers to build and how thick to make each layer by figuring out how much traffic will drive ...

As mentioned, permeable pavements eliminate impervious areas in a watershed, without sacrificing road and parking space. The permeable pavement itself is only the top layer of a larger permeable ...

Chip seal, another type of road material that is used for low-traffic areas, is created by depositing a thin layer of stone aggregate onto an asphalt layer, which itself had been deposited on existing ...