Discussion
A modern roadway which is made of three layers, its second layer is termed as :
Answer: A
The second layer is the base and sub-base.
A modern flexible road pavement is built in three parts. At the top is the wearing surface (surface course) of bituminous or concrete material that carries traffic directly. Beneath it is the base and sub-base of compacted crushed stone or granular material, which spreads the wheel loads and drains water. At the bottom is the subgrade, the prepared natural soil on which the pavement rests.
The wearing surface is the first layer and the subgrade the third. Geomembranes are synthetic sheets used as barriers in landfills, canals and some road works, not one of the three standard layers.
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