The subgrade resilient modulus values of Georgia counties are based upon historic soil support values, but with the increasing implementation of the 1993 AASHTO Pavement Design Guidelines and the initial adoption of the MEPDG system, more accurate subgrade resilient modulus values are required. To identify proper values and accelerate their adoption, a falling weight deflectometer paired with ground-penetrating radar can quickly determine the back-calculated resilient modulus values and validate the in-situ subgrade stiffness, and be compared to the implemented soil support values, without extensive laboratory testing procedures. Thus, decreasing the testing cost and time for pavement engineers to understand the design values for roadway subgrades.