Q. Which is the longest National Highway that passes through Bihar?
Answer:
NH 31
Notes: The longest National Highway that passes through Bihar is
NH 31.
NH 31 is a primary National Highway in India. It starts from Unnao in Uttar Pradesh and passes through Bihar and terminates at its crossing with State Highway 10 (West Bengal) at Samsi in Malda district of West Bengal. NH 31 transits across three states of India in east - west direction.