In the absence of stabilization provisions, the compacted subgrade is classified as what type of embankment?

• A. It becomes a typical roadway base
• B. It remains subgrade
• C. It becomes Stabilized Subgrade
• D. It becomes Embankment 100% standard

Answer: (D)

When there are no stabilization provisions, the compacted subgrade is treated as a standard, unmodified earth fill. Stabilization provisions would introduce additives or mixing to improve strength, but without them, the soil behaves like a typical embankment. In practice this is described as Embankment 100% standard, meaning it is a plain, unstabilized compacted subgrade rather than a stabilized subgrade or a different pavement layer. The other options don’t fit because a roadway base is a different layer above the subgrade, and “remains subgrade” would not reflect classification as an embankment, while “Stabilized Subgrade” requires stabilization features.