Simple linear regression analysis (SLRA) that CBR value decreases with increase in plasticity index and also increases with increase in maximum dry density. From SLRA coefficient of correlation R2 for plasticity index and maximum dry density are 0.72 and 0.78 respectively. The soaked and unsoaked CBR approximate values range between 3-9% and 14-38% respectively, Soaked CBR value of the subgrade is usually preferred for designing flexible pavements as it gives the CBR strength of subgrade soil under worst case scenario of a pavement being submerged under water for a minimum period of 4 days during floods in addition to the compaction process, preparation usually involves soaking each specimen in water for 96 hours before the penetration test. The CBR value obtained at 2.5mm penetration is normally higher than that at 5mm penetration and this is the value used

https://www.researchgate.net/figure/Soaked-and-unsoaked-CBR-values-of-all-samples_tbl3_326796881

https://www.researchgate.net/publication/308077145_Prediction_of_Soaked_CBR_Using_Index_Properties_Dry_Density_and_Unsoaked_CBR_of_Lean_Clay

https://www.slideshare.net/slideshow/prediction-models-for-estimation-of-california-bearing-ratio-for-cohesive-soil/115370457