Main job in road construction is to hold rocks together and stabilize Preventing soil erosion – stops soil from being washed away by rain or runoff.
* Supporting slopes and embankments – keeps roadside slopes from collapsing.
* Retaining earth – acts like a retaining wall where roads are built on raised ground.
* Improving drainage – water can pass through the rocks, reducing water pressure behind the structure.
* Protecting riverbanks and culverts – often used where roads cross streams or drainage channels.