What are the main types of road pavements?

Road pavements are classified as flexible (asphalt/bituminous) or rigid (concrete). Flexible pavements have multiple layers (subgrade, subbase, base, surface) that distribute loads through grain-to-grain contact, allowing slight deformation. Rigid pavements use concrete slabs that distribute loads over larger areas due to high flexural strength. Composite pavements combine both, typically asphalt over concrete. Selection depends on traffic, climate, subgrade, initial cost, and maintenance considerations.