What is harbour bridge?

The Sydney Harbour Bridge is a steel through arch bridge spanning Sydney Harbour in Sydney, New South Wales, Australia. It is one of the most famous landmarks in the world and a symbol of Sydney and Australia. The bridge is commonly known as the "Coathanger" due to its arch-based design.

The Sydney Harbour Bridge was designed by British engineers John Bradfield and Percy Allan and built by the Australian engineering company Dorman Long. Construction began in 1924 and was completed in 1932. The bridge is 1,149 metres (3,770 feet) long and has a main span of 503 metres (1,650 feet). It is the fifth longest spanning-arch bridge in the world and the longest spanning-arch steel bridge in the world.

The Sydney Harbour Bridge is a multi-purpose bridge that carries road, rail, bicycle and pedestrian traffic. It has eight traffic lanes, two railway lines and a cycleway on the eastern side of the bridge, and a footpath on the western side. The bridge is also used for special events, such as fireworks displays and the annual Bridge Climb.

The Sydney Harbour Bridge is one of the most visited tourist destinations in Australia. It is a popular spot for taking photographs and enjoying the views of the city. The bridge is also used as a setting for many films and television shows, including Mission: Impossible II, The Matrix, and Superman Returns.