The full form of WBM is Water Bound Macadam Road which is the most usually utilized street development technique for over 100 years. The Water Bound Macadam is named dependent on the Scottish specialist John Loudoun Macadam who previously presented and builds the WBM street.

Water Bound Macadam is a kind of adaptable asphalt wherein the base and surface layer contains squashed stone or broken stone pieces and materials are all around interlocked with the assistance of a mechanical roller. Then, at that point, the voids are loaded up with the assistance of screening material and restricting materials (stone residue) alongside water and compaction.

The thickness and the quantity of each compacted layer in WBM rely on the plan thought and stacking. Be that as it may, they for the most part fluctuate from 7.5 cm to 10 cm thick.