Inspection is paramount for the integrity of pavements, roads, and runways. NDT methods such as ground-penetrating radar (GPR), impact echo testing, and falling weight deflectometer (FWD) are indispensable in ensuring safety, quality control, and cost-effectiveness in transportation infrastructure. These techniques allow for early detection of hidden defects, subsurface weaknesses, and structural problems, ultimately preventing expensive repairs and prolonging the life of critical infrastructure