According to Wheeler, of silt was reckoned to cover in a length of a road, thick and wide, the silt costing about 8d. to 10d. per ton for digging and spreading. In some cases the road was turned over. That is a pit was dug in the road until the silt was reached then that was dug out and formed into the carriageway. The surface of the next length was dug and put into the pit as a foundation then the silt dug and placed on top of it and so on along the road.