Introduction
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When permanent bridges are not possible, Bailey bridges, a sort of portable, prefabricated truss bridge, are used all over the world to offer temporary crossings for cars and pedestrians. Bailey bridges are essential for linking isolated districts in Kolkata and West Bengal, particularly in times of emergency such as natural catastrophes or when repairing existing infrastructure is necessary. At 5,602 meters (18,379 feet) above sea level, a Bailey bridge that spans the Suru and Dras rivers in Ladakh, India, is the highest bridge in the world. It was constructed by the Indian Army in 1982.The oldest bridge in Kolkata is the Howra bridge.Consulting engineers M/s. Rendell, Palmer, and Tritton developed the new Howrah Bridge. The bridge took eight years to build, requiring 26,000 tons of steel, of which 18,200 tons were of high tensile quality.A massive steel bridge that spans the Hooghly River, the Howrah Bridge is a well-known landmark in Kolkata. It is regarded as one of the world's longest cantilever bridges. It is also referred to as Rabindra Setu and it links Kolkata and Howrah. Every day, it transports 100,000 cars and countless pedestrians.