[1] It was previously referred to as Delhi–Kolkata Road and is one of the busiest national highways in India.

[2][3] It constitutes a major portion of the historical Grand Trunk Road.

It is also part of AH1 of Asian Highway Network, that traverses from Japan to Turkey.

The highway has a length of 1,269.7 km (789.0 mi) and runs through the states of Uttar Pradesh, Bihar, Jharkhand, and West Bengal.

[4][2] The lengths of the highway in each state are: National Highway 19 connects Agra to Kolkata and transits four states of India, namely Uttar Pradesh, Bihar, Jharkhand and west Bengal.