Explanation:

Th then Asia’s longest river bridge, Mahatma Gandhi Setu, popularly known as the Gandhi or Ganga Setu, is a marvel of both engineering design and technology. Inaugurated by the then prime minister Indira Gandhi in 1982, the 5.75km-long bridge became the lifeline of north Bihar.

Touted as a true engineering marvel, a miracle of equilibrium and graceful in appearance, it was constructed by Gammon India with an expenditure of Rs 87.22 crore. The river bridge has 45 intermediate spans of 121.065 metres each and one span of 65.530 metres on both sides. The technology used in the bridge was prestressing — cantilever slabs with hinge bearings and box girder.