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In keeping with the government's Waste to Wealth initiative and to promote ecologically friendly National Highways building, the NHAI has started a trial use of Steel Slag in road construction. With the help of this project, the problem of a lack of materials for building the National Highways will be addressed. Waste from the steel industry may be utilised in place of natural aggregates like sand, gravel, or crushed stone. NHAI began testing steel slag's potential for use in road construction with the goal of creating India's first Pavement Quality Concrete (PQC) with it. The authority approved the construction of a one-kilometre trial patch by Central Road Research Institute (CRRI) for the Panvel-Indapur portion of NH 66 near Bombay, where steel slag-derived aggregates were used in place of 100% natural aggregates. The trial's findings have been favourable. The road built using steel slag is an illustration of how waste may be turned into wealth. The NHAI has been promoting the innovative use of new alternative materials such utilisation of plastic waste, building & construction waste, etc. The use of such materials in road construction will reduce construction costs and advance resource efficiency and the circular economy.