The strength of subgrade soils is dependent on the type of soil, density and moisture content. Hence to determine the subgrade strength, which would be used for design of the road pavement structure, it is apparent to ascertain the density-moisture content-strength relationship specific to the subgrade soils encountered along the project road. The design CBR of the subgrade soil, therefore, should be evaluated at the moisture content and density representative to the subgrade condition during the service time of the pavement structure. For wet or moderate climatic zones and where the ground water influences the subgrade moisture content, the CBR test is carried out after 4 days of soaking. Laboratory investigations have been carried out on a number of soil samples. Preliminary tests, such as index tests and particle size distribution tests, used for soil classification, have been taken up followed by Proctor compaction and CBR tests. CBR tests have been conducted for same samples under various conditions of soaking, with due emphasis on moisture content parameters in the soil sample