Selection of layer thickness

The determination of the thickness of a new pavement and effectively the thickness of each layer may be carried out by two alternative ways (a) by selection of layer thickness or (b) by layered design analysis. 

Once the structural number of the pavement (SN) is determined, using the equation given in Section 13.4.5, the thickness of each layer (D,) is determined by selecting layer thicknesses so that the right-hand side of the equation is equal to SN. This implies that this method does 

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