Moisture increase in pavement subsurface layers has an essential influence on granular material properties and affects expected pavement performance. Over time, moisture variations in the base layer of a flexible pavement depend on water infiltration after rain and pavement surface conditions. Consequently, the base layer resilient modulus (MR) is decreased considerably, which leads to premature failure and reduced service life of the pavement. This report presents LTPP data analyses for quantifying the effect of moisture infiltration through surface cracking on flexible pavement performance. The summary report can be downloaded from https://www.fhwa.dot.gov/publications/research/infrastructure/pavements/ltpp/20006/
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