Sydney Harbour Tunnel

Sydney Harbour Tunnel

Southern entrance to the Sydney Harbour Tunnel, northbound
Overview
Location	Port Jackson
Coordinates	33°51′09″S 151°12′43″E / 33.85260°S 151.21187°E / -33.85260; 151.21187
Status	Active
Route
Start	Warringah Freeway
End	Cahill Expressway
Operation
Work begun	February 1988
Opened	30 August 1992
Owner	Transport for NSW
Operator	Ventia
Traffic	Automotive
Toll	Time of day tolling (southbound only)
Vehicles per day	96,000 (2017)
Technical
Length	2.8 km (1.7 mi)
No. of lanes	4
Operating speed	80 km/h (50 mph)
Tunnel clearance	4.4 m (14 ft 5 in) vehicle clearance,
Width	10.5 m (34 ft 5 in)[1]
Depth of tunnel below water level	25 metres (82 ft)
Depth of shipping channel above	16 m (52 ft)[1]

The Sydney Harbour Tunnel is a twin-tube road tunnel in Sydney, 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 a set of rail tunnels for the Sydney Metro.^[2][3]

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.^[4][5]