Abstract: This study looks at the effects of poor soil properties on highway pavement failure on critical locations along Aramoko-Ilesha road, Nigeria. Laboratory soil tests on the sample collected showed the moisture content range 8.44-21.63%, specific gravity from 2.30-2.80, liquid limit from 27.30-42.50%, linear shrinkage from 8.9-9.9%, plasticity index from 1750-2050 kg m 3, optimum moisture content from 10.00-18.00% and California bearing ratio from 5.45-36.64%. The liquid limit and the plasticity index do not conform to specification and the CBR values were far below the values specified for subbase and base course of road pavement. It was discovered that the use of materials with poor properties was responsible for the failure of these locations.