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Subgrade is the part of a road construction that is composed of the top layer of soil upon which the road pavement is built. It serves as the foundation for the entire road system and acts as a cushion between the road pavement and the underlying soil.
Subgrade is the part of a road construction that is composed of the top layer of soil upon which the road pavement is built. It serves as the foundation for the entire road system and acts as a cushion between the road pavement and the underlying soil.
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