Functional overlays are defined as thin treatments using a hot mix system. A thin treatment is a non-structural layer and is applied as a preservation or maintenance treatment, either corrective or preventive.

• A. Sometimes
• B. True
• C. Not applicable
• D. False

Answer: (B)

Functional overlays are meant to be thin, non-structural surface treatments applied with a hot-mix asphalt system. Because they’re thin, they’re not intended to restore or carry additional structural load; instead, their job is to protect and improve the surface. They can be used to correct surface issues (like cracking, roughness, or oxidation) or to prevent future problems, extending the pavement’s life. That alignment with being a thin, surface-focused treatment used for preservation or maintenance makes the statement true. The other options don’t fit because this is a defined, consistent characteristic of functional overlays, not something variable or inapplicable.