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In this study, the authors estimated the influence of abnormal signals, obtained by the explorations of underground radars in the road surface lower cavity, by FWD test on the soundness of the pavement in the urban areas. We confirmed that the abnormal signals were classified into cavities, loosening and buried objects, and that the FWD deflection directly above each of the abnormal signals became larger than those of the sound points. However, it was not possible to discover the direct correlations of the FWD deflection with the breadth and the depth of the cavities and the loosening points. Accordingly, we used the "isotropic circular analysis" and confirmed the usefulness of the method of evaluating the risks of sinking and caving in of the points emitting abnormal signals.