Poor drainage in the road bed is a frequent cause of this degradation of the base or subgrade. There are many ways that the subbase or base can be weakened. Frequently, overloading happens because the base or subbase inadequately support the surface layer and subsequently cannot handle loads that it would normally endure.
However, fatigue cracking can be greatly influenced by environmental and other effects while traffic loading remains the direct cause. Fatigue cracking is an asphalt pavement distress most often instigated by failure of the surface due to traffic loading.
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