Select material may be used where in the flexible pavement embankment construction?

• A. Anywhere
• B. Only in base
• C. Not allowed
• D. Only in subgrade

Answer: (A)

In flexible pavement embankment construction, a select material is chosen for its favorable properties—proper gradation, low organic content, and good compaction and drainage. Because these properties can meet the specifications of different layers, that material can be used in any layer that requires it, whether in the subgrade, subbase, or base, as long as it complies with the design criteria for that layer. This flexibility is why the best answer is that it may be used anywhere in the embankment construction. Using it only in one layer or deeming it not allowed ignores the material’s ability to meet the specific requirements of multiple layers.