The base course of a WBM road consists of.
1
120 to 180 mm stone placed on their ends upwards.
2
120 to 180 mm stone placed on their ends upwards + 50 mm stone Macadam + water.
3
120 to 180 mm stone placed on their ends upwards + 50 mm stone Macadam + water + 2 layers of metal each 150 thick.
4
120 to 180 mm stone placed on their ends upwards + 50 mm stone Macadam + water + 2 layers of metal each 150 thick + Rolled + Screenings applied.