In order to connect one place to another, the entire width of the land is made solid. This is called road. The management of its construction is called road work. It is classified according to the density and design of the traffic, such as National highways, state highways, district roads, village roads, etc.
FORMATION LEVEL OF THE ROADS
Before making Solid roads, roads are made in level throughout its width and reached up to that level on which the solid road is to be built. This level is called formation level. The processes upto to this level of work are the same as The time taken for building the upper layer should be minimum one year and the land is prepared before hand so that the layer becomes hard completely. This is the case if machines are not used for filling the soil and specified compaction tests are not performed.
Main parts of the roads
1. Sub Base: After the formation level of the road the first layer is called sub base. Its main objective is to protect the sub grade from the possibilities of getting damaged during construction work. Its materials is slightly of different quality than the base material.
2. Base: It transfers the traffic load uniformly on the soil. It is made through the process of making the soil strong. This soil may be stone dust or soil
made by other processes.
3. Upper layer: This is called surfacing, which is made by bitumen concrete or stone chips which are compacted by water. This gets eroded or broken
while the traffic moves and it can be easily repaired without removing the lower layers.