Is the roadbed constructed by excavating from fill sections?

The construction of a roadbed involves a specific process that generally does not involve creating it solely by excavating from fill sections. A roadbed is primarily formed by using engineered materials that provide adequate stability and support for the pavement structure. While both cut and fill are essential components of road construction—where cut refers to removing material to create a lower point and fill refers to adding material to elevate an area—the roadbed itself is typically built up using selected materials rather than being excavated from other sections.

In standard practice, a balanced cut-and-fill approach is often employed to maintain proper grading and drainage. Thus, while excavating material from high spots (cut sections) can provide some of the necessary materials for fills, the roadbed itself is not constructed solely by utilizing fill from excavation. This understanding supports the assertion that the answer is no, as roadbed creation is more complex than just taking material from fill sections.