National Highway 16 (NH 16) also known as Kolkata - Chennai Highway is a major National Highway in India that runs along east coast of West Bengal, Odisha, Andhra Pradesh, and Tamil Nadu.

The northern terminal starts at Dankuni near Kolkata, West Bengal and the southern terminal ends at Nallur near Chennai, Tamil Nadu.

It is a part of the Golden Quadrilateral project to connect India's major cities.

[2][3] Many cities and towns across the states of West Bengal, Odisha, Andhra Pradesh, Telangana, and Tamil Nadu are connected by National Highway 16.

NH 16 has a total length of 1,764 km (1,096 mi) and passes through the states of West Bengal, Odisha, Andhra Pradesh and Tamil Nadu.