A thin layer of flexible pavement over rigid pavement is an ideal pavement with most desirable characteristics. In addition to these, composite pavements are also available. On the contrary, in rigid pavements, wheel loads are transferred to sub-grade soil by flexural strength of the pavement and the pavement acts like a rigid plate (e.g. The flexible pavement, having less flexural strength, acts like a flexible sheet (e.g. In flexible pavements, wheel loads are transferred by grain-to-grain contact of the aggregate through the granular structure. The pavements can be classified based on the structural performance into two, Improper design of pavements leads to early failure of pavements affecting the riding quality also. Different types of pavements can be adopted depending upon the traffic requirements. Each layer of pavement has a multitude of functions to perform which has to be duly considered during the design process. Pavements form the basic supporting structure in highway transportation.
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