The Marrickville Tunnel is a possible underground road tunnel that would link Sydney Airport

Sydney Airport

Sydney Airport may refer to:* Sydney Airport, also known as Kingsford Smith International Airport, in Sydney, Australia* Sydney/J.A. Douglas McCurdy Airport, in Nova Scotia, Canada...

 to an undetermined location on Parramatta Road

Parramatta Road

.Parramatta Road is the major historical east-west artery of metropolitan Sydney, Australia, connecting the Sydney with Parramatta. It is the eastern-most part of the Great Western Highway. Much of its traffic has been diverted to modern expressways such as the M4 and the City West Link...

. Two possibilities mentioned in the media have been a link to Lewisham

Lewisham, New South Wales

Lewisham is a suburb in the inner-west of Sydney, in the state of New South Wales, Australia. Lewisham is located 8 kilometres south-west of the Sydney central business district, in the local government area of Marrickville Council. The postcode is 2049...

, whilst others mention a possible connection to the end of the Metroad 4

Metroad 4

Metroad 4 is a Metroad in Sydney, New South Wales, Australia. It connects the inner-west of Sydney with the outer western suburbs. It mostly follows what was previously National Highway 32 from the Western Distributor in the CBD, west to the Great Western Highway at Lapstone...

 motorway at Strathfield

Strathfield, New South Wales

Strathfield is an Inner West suburb of Sydney, in the state of New South Wales, Australia. Strathfield is located 14 kilometres west of the Sydney central business district and is the administrative centre of the local government area of the Municipality of Strathfield...

.

A tunnel may help to remove trucks transporting goods to and from the airport and Botany Bay

Botany Bay

Botany Bay is a bay in Sydney, New South Wales, a few kilometres south of the Sydney central business district. The Cooks River and the Georges River are the two major tributaries that flow into the bay...

 from non-motorway roads, and could potentially reduce "rat-running" (whereby commuters opt to drive to and from work using suburban back-roads instead of main roads, because the main roads are too overcrowded and slow at peak hour).

External links

• Sydney Morning Herald article: "The next idea for the M4 - dig".
• Possible route from Lewisham to the airport.
• Marrickville Transport Action Group and marrickvilletag.org.