Practice question

What causes "alligator cracking" (fatigue cracking) in asphalt pavements, and how must it be repaired?

Caused by subgrade failure under load; repaired by full-depth reconstruction.
Caused by excessive sealcoat thickness; repaired by power washing the top layer.
Caused by dropping glass beads onto cold paint; repaired by repainting lines.
Caused by tree sap dripping on asphalt; repaired by applying clear wood finish.

Answer: A — Caused by subgrade failure under load; repaired by full-depth reconstruction.

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