Design Elements cover the various physical aspects of the highway structure. The article would discuss the elements, their purpose and general standards for them.
The article can be sub-divided into basic highway facility elements such as bridges, tunnels and roadways. In turn they can be sub-divided. For instance, roadways can be single or dual, intersectioned or grade-separated, and urban or rural. Each type can have different elements and standards for number of lanes, shoulders, means of drainage, grades and curves, and the like.