Explanation:

National Highway 1 or NH 1 was a National Highway in Northern India that linked the national capital New Delhi to the town of Attari in Punjab near the India–Pakistan border. The Grand Trunk Road or National Highway Number 1 will now be a part of the country's longest stretch of primary route rechristened as National Highway 44 , according to a fresh government notification that also gives the states the new names for all the highways.

Old National Highway 2 or Old NH 2, was a major National Highway in India, that connected the states of Delhi, Haryana, Uttar Pradesh, Bihar, Jharkhand and West Bengal.

National Highway 3 (old number), or Old national NH 3, commonly referred to as the Agra–Bombay Road or just Agra Road in Bombay, was a major Indian National Highway that ran through the states of Uttar Pradesh, Rajasthan, Madhya Pradesh and Maharashtra in India

A stretch of national highway from Mumbai to Pune to Hubli to Bangalore to Chennai was earlier called NH 4 before renumbering of national highways in 2010. The former NH 4 is now renumbered as NH 48.