C.B.R. Method is mainly used in Japan as the thickness design method for bituminous airport pavements. In C.B.R. Method multiple-wheel loads are converted into equivalent single-wheel loads by which the C.B.R. design curve can be constructed.
　This convertion needs deflection factors as factors in connection with deflections which are produced in a semi-infinite elastic body by uniform circular loads. This paper shows deflection factors in terms of numerical values in a table.