CBR (California Bearing Ratio) Testing machine helps in calculating the CBR with the help of  load penetration test under controlled laboratory environment. The California bearing ratio test is performed assists in assessment of sub-grade power of concretes and roads. 

The results are combined with empirical curves for to find out the thickness of pavement as well as its component layers. It is widely used in the process of making designs of  flexible pavement, CBR thickness for highways and airfield pavement after evaluating all the components if the specimens.