Sydney Orbital Network

The Sydney Orbital Network is a 110-km motorway ring-road in the city of Sydney, Australia. Planning for the road began in the 1980s and the last link, the Lane Cove Tunnel, opened in March 2007. The orbital runs north from Sydney Airport past the CBD to the North Shore, west to the Hills District, south to Prestons and then east to connect with the airport. Much of the road is privately-owned and financed by tolls.

Motorways

General Holmes Drive
Southern Cross Drive
Eastern Distributor, tolled northbound
Domain Tunnel
Sydney Harbour Tunnel, tolled southbound
Warringah Expressway
Gore Hill Freeway
Lane Cove Tunnel, tolled
M2 Hills Motorway, tolled
Westlink M7, tolled
M5 South Western Motorway, tolled
M5 East

Highway links

Intercity highways are linked to the Orbital, moving traffic away from the old busy National Routes. They are:

Pennant Hills Rd -- linking Sydney-Newcastle Freeway to M2 Motorway
M4 Motorway -- linking Great Western Highway to Westlink M7
M5 Motorway South -- Casula to Hume Highway
King Georges Rd -- linking M5 Motorway to Princes Highway, Southern Freeway and Wollongong

Missing Highway links

Link to the F3 Sydney-Newcastle Freeway -- The final stage of a motorway standard Sydney Bypass, a tunnel under Pennant Hills Rd is in the planning stages.^[1]
Link to the F6 Southern Freeway -- At present, there are no plans to complete this link as freeway standard. The only section which was built is the Captain Cook Bridge and its approaches. Land is still reserved north of this point through Sandringham, and south through the Royal National Park. This still leaves a considerable length of the corridor built out, which will require great expense to resume, or tunnel beneath.
Marrickville Tunnel -- Proposal to link the orbital ring road at Port Botany with the M4 Motorway, to remove commercial traffic from inner west surface roads.
M4 East -- Extension of the M4 Motorway to the Anzac Bridge. This proposal has been reviewed and cancelled following stiff community opposition, which cited encouraging additional commuter traffic into the CBD, whilst removing little commercial traffic from the area.