Sydney Harbour Tunnel

The Sydney Harbour Tunnel is a twin-tube road tunnel in Sydney, New South Wales, Australia. The tunnel was completed and opened to traffic in August 1992 to provide a second vehicular crossing of Sydney Harbour to alleviate congestion on the Sydney Harbour Bridge. It is one of two transportation tunnels under the harbour, the other being twin rail tunnels used by Sydney Metro. The tunnel joins the Warringah Freeway at North Sydney and the Cahill Expressway at the entrance to the Domain Tunnel. It has two lanes in each direction, and runs at an angle of approximately thirty degrees (north to south) to the Sydney Harbour Bridge, which has eight lanes, with a tidal flow operation. In 2017, the tunnel was carrying around 96,000 vehicles per day.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).