a description is given of the features of the aasho road test that are relevant to the issue of the damaging power of wheel loads and to the derivation of the widely used fourth-power relationship between the magnitude of a wheel load and its damaging power. the results of the road test are then re-analysed to give more logical damage relationships that take into account the fact that an in-service road deteriorates to failure under the action of a wide spectrum of wheel loads applied in a random sequence. the relations obtained do not fit simple power laws; effective exponents range from about 3 to over 6 with the highest values occurring on weak pavements trafficked by heavy wheel loads, at or above the present legal limit.(a)

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