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NHAI is an autonomous agency of the Union Government, responsible for management of a network of over 70,000 km of national highways in India.
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It was established through National Highways Authority of India Act, 1988.
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In February 1995, it was formally made an autonomous body.
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It is a nodal agency of the Union Ministry of Road Transport and Highways.
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It is responsible for the development, management, operation and maintenance of National Highways.
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It is a statutory body.