The first roads were carved into landscapes by humans traveling widely frequented
routes over and over again. Foot traffic trampled plants and compressed soils, leaving
behind lasting pathways. These roads were adequate for the weight of humans.
However, the invention of the wheel and the burdens placed upon it created a need for
something more. Carts and wagons were sinking into mud, causing delays for traveling
humans. Soon, to keep things moving, humans began covering roads with stones, then
crushed rocks, and eventually asphalt.
Why is the detail about the invention of the wheel included before describing advances in
roadway technology?
It shows roads were necessary in order to stop the further destruction of plant life.
It describes how people traveled to learn new ideas about how to build better roads.
It helps explain why the first roads used by humans were no longer sufficient.