Abstract: Falling weight Deflectometer (FWD) testing is today the common tool used to assess the structural condition of the pavement. The objective of the study was to analyse the FWD surface deflection test results of flexible pavement for the Nairobi Eastern by-pass to predict the pavement’s structural capacity. The study observed that the pavement exhibits varying characteristics from strong pavement to moderate pavement as the deflections values fluctuates along the pavement length with much of the pavement stretch being characterized as reasonably strong.