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Potholes are abundant in warm countries with heavy rainfall due to the combination of heat, moisture, and traffic stress. Here's why:

1. Water infiltration: Rainwater seeps through small cracks in the road surface, weakening the underlying soil or roadbed.
2. Weakened asphalt: In warm temperatures, asphalt softens, making it easier for water to penetrate.
3. Traffic stress: As vehicles pass over weakened areas, the road structure collapses, forming potholes.
4. Poor drainage: Heavy rainfall without proper drainage exacerbates water accumulation, speeding up pothole formation.