At present, the road section under construction initially, incomplete, many road segments under construction as the background or lu lèn levels gravel, stone offers. The lu lèn is made from low to high, to avoid the phenomenon of dislocation of the land, for the straight line from the edge of the road to the heart, lu for the curve, then the lu from the abdomen to the back curve. The speed of lu must slowly enough to materials ensure tight enough and highly effective
đang được dịch, vui lòng đợi..