What is a common reason for pavement distress in highways?

Improper drainage is a common reason for pavement distress in highways. When drainage systems are not functioning correctly or are inadequately designed, water can accumulate on or beneath the pavement surface. This trapped moisture can weaken the underlying layers of the pavement, leading to issues such as cracking, heaving, and even complete pavement failure.

Water infiltration can erode the subgrade material, reducing its load-bearing capacity and leading to the formation of potholes and ruts. Additionally, freezing and thawing cycles can exacerbate these problems, causing expansive forces that further damage the pavement structure. Effective drainage is crucial to preserving the integrity and longevity of highway surfaces, making it a primary focus in the design and maintenance of roadway systems.