The Bihar stretch of NH 2 starts from the bridge on the Karmanasa River that forms the border with Uttar Pradesh.
NH 2 runs for 202 km in the state and then enters Jharkhand, between Dobhi and Chauparan, around Barachatti. In between it passes through Kaimur district. Mohania is the first major town on it. Also NH 30 is connected to NH 2 in the city and leads to Patna city. The next city is Sasaram where there is the tomb of Great Emperor Sher Shah Suri. At Dehri- on-Son it crosses the wide expanse of the Son River over the Jawahar Setu. At Dobhi it meets the road to Gaya and Patna (NH 83). NH 98 from Patna to Daltonganj crosses NH 2 at Aurangabad.

NH 2 in Jharkhand
NH 2 in West Bengal
NH 2 in Uttar Pradesh
NH 2 in Bihar