What is second link bridge?

It is unclear which specific bridge is being referred to as the "second link bridge," as there are several bridges around the world that may go by this name. However, here is some information about two possible candidates:

1. Second Link Bridge in Malaysia: This bridge, officially known as the Malaysia–Singapore Second Link, is a bridge and causeway that connects the city of Johor Bahru in Malaysia to Tuas in Singapore. It spans about 1.2 miles (1.9 km) across the Straits of Johor and was opened in 1998. The bridge was built to alleviate traffic congestion at the Causeway, which is the other major land link between the two countries. The Second Link Bridge is a toll bridge and is also used by goods vehicles transporting goods between Malaysia and Singapore.

2. Second Link Tunnels in Sydney, Australia: This project, also known as the Sydney Harbour Tunnel Duplication, involves the construction of two new tunnels alongside the existing Sydney Harbour Tunnel to increase capacity for traffic entering and exiting the central district of Sydney. The new tunnels are each about 1.2 miles (1.97 km) long and were opened to traffic in 2020. The project cost over $3 billion AUD (approximately $2 billion USD) and is expected to ease congestion on one of Sydney's major transport routes.