Road construction and freeways

The expansion of the automotive industry on the one hand and the development of the road construction industry on the other hand caused intercity roads to see heavy traffic, which in turn increased traffic accidents and increased transit costs. Therefore, the construction of freeways as a suitable solution to increase traffic safety and traffic capacity and reduce fuel costs, vehicle depreciation, etc., was considered by the road construction industry.

Freeway or freeway is a road with separate lanes that have no level crossing and entry and exit is limited. Freeways are often toll-free and are usually built outside the cities. In general, freeway is a road with asphalt or concrete pavement for fast passage of motor vehicles whose roundabout is completely separate from each other and has no level intersections, entering and exiting it exclusively in certain and limited points of the route. And its sides have mesh or concrete walls to prevent humans and animals from entering.

Free road construction goals

Improve the level of safety and health of the passage
Increase the speed of goods and passenger transport
Reduce fuel consumption and vehicle depreciation
Reduction of environmental pollutants
Increase the comfort and convenience of road trips
Growth and development of economic, tourism, cultural and ...
Creating direct and indirect employment

Definitions and terms of freeways

Protective asphalt Spreading bitumen on sandy, asphalt and concrete dirt roads and immediately spreading aggregate on it (surface asphalt), or aggregates or sand coatings, or bituminous spraying without aggregate, or spreading slurry asphalt, or microsurfacing, is called protective asphalt.
Cold asphalt Cold asphalt is prepared by mixing rock materials or soluble bitumen, or water bitumen or tar at ambient temperature and is spread and compacted at the same temperature.
Porous asphalt Porous asphalt is prepared by mixing bitumen with broken aggregates with open granulation in an asphalt plant.
Cortical basis One of the stone materials with technical specifications and a certain thickness that is placed on the prepared bed or pavement layer, in order to withstand the loads coming from the higher pavement layers, is called the base layer.
Sandy and rocky base It is the broken materials of river sand or rocks of mountain mines with certain technical specifications that are placed on the substratum or pavement bed with the desired geometric dimensions.
Bitumen base A mixture of stone and bitumen materials with technical specifications and a certain thickness that is placed on the prepared bed of the road or substrate layer, in order to withstand the loads from the higher pavement layers, is called bitumen base layer.