Causes of Pavement Distress include which factors?

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Pavement distress arises from the combined effects of how the pavement is loaded, the surrounding environment, drainage performance, and the quality of the materials used. Heavy wheel loads cause repeated bending and shear in the pavement, leading to fatigue cracking and rutting. The environment, including temperature swings and moisture, speeds up cracking, loss of strength, and other damage, especially when moisture penetrates the pavement structure. When drainage is poor, water lingers in the pavement layers, reducing strength and accelerating issues like stripping, potholes, and frost-related damage. Material deficiencies—such as using low-grade aggregates, insufficient binder, or not achieving proper compaction—lower the pavement’s structural capacity and resilience, making distress appear sooner. The other factors listed don’t directly drive distress in the same way: wildlife crossings are safety concerns rather than a primary cause of pavement deterioration, and noise levels or sun exposure alone don’t cause the pavement to fail as those combined factors do.