Bring out the salient features between one, two and three$-$layer pavement systems. Sketch the multilayered pavement system with all inputs and assumptions involved. A circular load with a radius of $152mm$ and a uniform pressure of $552$kPa on a two$-$layer system is applied $($shown in Figure $1).$ If the HMA has an elastic modulus of $3\mathrm{.}45$GPa, what is the required thickness of a full$-$depth pavement? The subgrade has an elastic modulus of $35$MPa and can support a maximum vertical stress of $5$kPa. If a thin surface treatment is applied on a granular base with elastic modulus $173$MPa, find thickness of the base course required?