The 'pavement distress' type called 'crocodile cracking' (alligator cracking) indicates:
Choose the correct answer
Surface abrasion from tyre friction only
Structural fatigue failure — interconnected fatigue cracks from repeated flexion of weakened bituminous layer or subgrade failure
Only at road edges due to lack of shoulder
Plastic deformation (rutting) under heat
Correct Answer
B. Structural fatigue failure — interconnected fatigue cracks from repeated flexion of weakened bituminous layer or subgrade failure
Why is this the answer?
Crocodile/alligator cracking: pattern of interconnected cracks creating small polygons (fatigue cracking in base or subgrade failure zones). Indicates structural fatigue failure of bituminous layer from repeated traffic loading. Causes: (1) Inadequate pavement thickness; (2) Weak subgrade; (3) Poor drainage; (4) Overloaded vehicles. Repair: full-depth reclamation or structural overlay. Distinct from surface cracking (thermal) or edge cracks (poor shoulder).
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