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Abstract: A robust transportation infrastructure is critical to the nation's industrial, social, and cultural advancement. Humans have evolved three forms of transportation: air, sea, and land as a result of this requirement. From 4 lakh km in 1947 to 20 lakh km in 1993 and approximately 62 lakh km by March 31, 2020, the road network has grown. In India, the total length of all roads paved and unpaved is less than 5.13 km per 1000 inhabitants. Before we get into the maintenance section, we will try to concentrate on various defects and their causes. The research indicates that the definition of flexible pavement defects and their causes is the reduction in serviceability brought on by the development of various types of deterioration on the flexible pavement, such as cracks, surface defects, disintegration, etc. The breakdown of bituminous pavement can have numerous causes.
B. Prasad (Thu,) studied this question.