For those who may not be familiar, AASHTO (American Association of State Highway and Transportation Officials) provides guidelines for flexible pavement design, which is a widely used method for designing pavement structures.
The AASHTO flexible pavement design method is based on the following equation: aashto flexible pavement design excel spreadsheet
log10(W) = Zr * S0 + 9.36 * log10(SN+1) - 4.14 - 0.20 - 0.372 * (SN+1)^(1/3) / (p+1) For those who may not be familiar, AASHTO
A very specific topic!