This project develops a mechanistic–empirical framework for designing flexible pavements by integrating stress, strain, and deflection criteria across multi-layered systems. The research focuses on improving weak natural subgrades through compacted subgrade layers, optimizing pavement thickness for low- and high-volume roads, and extending service life under repeated axle loads. Using Odemark’s transformation and Boussinesq’s theory, the work evaluates effective California Bearing Ratio (CBR), v