Adjusted Structural Number (SNP)
Adjusted Structural Number (SNP) : A pavement strength parameter, being an enhancement of the Modified Structural Number (SNC), developed to address difficulties experienced with the use of SNC for the description of pavements which incorporate lower layers of selected subgrade, or which have very thick subbase or lower subbase layers. The SNP applies a weighting factor, which reduces with increasing depth, to the subbase and subgrade contributions so that the pavement strength for deep pavements is not over-predicted. For pavements less than 700 mm thick the Modified Structural Number (SNC) and the Adjusted Structural Number (SNP) are virtually the same
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