What are the common types of flexible pavement distresses?

Flexible pavement distresses include: Load-related - fatigue (alligator) cracking from repeated loading, rutting from permanent deformation in any layer. Environmental - thermal cracking (transverse cracks from low temperatures), weathering/raveling from UV and water damage. Surface defects - bleeding (excess asphalt), polishing, potholes. Distortion - corrugation, shoving, depressions. Each distress type indicates specific failure mechanism and guides rehabilitation strategy. PCI (Pavement Condition Index) quantifies overall condition.