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>> Construction and maintenance of roads and bridges

Street derives from “strata” or layers. In fact, in Roman times, multiple layers of suitable material gave streets their structural characteristics.Today’s road-paving material is made by mixing appropriate amounts of large and fine aggregates (gravel, sand, and filler) with bitumen (leftover from the evaporation of petrol). Roads must withstand heavy concentrated loads, wear, deterioration by physical and chemical agents, thermal expansion, and at the same time allow optimal tire grip. Therefore, road maintenance is essential to ensure their correct functionality.