The highway links Bihar to West Bengal via Jharkhand.

This highway connects some major cities of Bihar such as Munger and Bhagalpur to the capital city Patna.

This highway is known as the worst highway of India as the stretch between Sahibganj to Farakka is the most dangerous & full of Poth holes.

Currently this Highway is 4 lane in between Jehanabad to Biharsharif.

4 Lane making is going on between Arwal to Jehanabad, Mokama to Bhagalpur, Bhagalpur to Sahibganj & Sahibganj to Rajmahal.