In civil engineering, the California Bearing Ratio (CBR) test is one of the most common ways to figure out how strong the soil is. By measuring how much weight the subgrade dirt can hold, it gives engineers important information for planning roads, highways, airports, and other pavement structures. Engineers can make better choices about construction when they know how the test works and why it's important.

CBR test of soil is a test that is taken to determine the resistance of the ground to penetration under load. It provides a comparison of the strength of soil in relation to a standard value to come up with the load-bearing capacity. This technique is applicable because it is easy, reproducible, and useful in assessing the strength of the subgrade under field conditions.