Answer & Explanation
* Prime Minister Narendra Modi on 25th Dec 2018 inaugurated the 4.94 km long Bogibeel Bridge in Assam.
* It is India’s longest rail-cum-road road bridge, on the river Bramhaputra.
* The bridge is constructed at an estimated cost of 5,800 crore rupees.
* It is situated 17 km downstream of Dibrugarh city in Assam.