What is a subgrade modulus and how is it used in pavement design?

What is a subgrade modulus and how is it used in pavement design?

• A. The maximum bearing capacity of the subgrade soil.
• B. A stiffness parameter k for subgrade support used in pavement structural analysis.
• C. A measurement of soil permeability affecting drainage.
• D. A density value of subgrade material used in compaction.

Answer: (B)