Considerable hardening of the binder occurred throughout the depth of the overlays during the first five to seven years, but negligible rutting developed. The main form of deterioration was cracking which was initiated at the surface of the overlays. The reduction in pavement deflections produced by the overlays is shown to be only slightly less than those obtained in Britain despite the higher ambient temperatures in Kenya. The performance of the overlays is shown to be primarily dependent on the properties of the overlays material itself. No correlation could be established between the development of cracking on each test section and the corresponding values of surface deflection and curvature, traffic loading or overlays thickness.