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O-Bahn City Access Project

Project Overview 

Note: Concept for illustration purposes only.

The O-Bahn City Access Project builds on the State Government’s significant investment in a stronger public transport network and the government is committed to delivering the best possible outcome for our great city.

The primary objective of the O-Bahn City Access Project is to improve travel times and reliability for users of the O-Bahn service between the end of the busway at Gilberton and Grenfell Street and to reduce traffic congestion and delays, particularly on the Inner Ring Route.

The $160 million project will extend the O-Bahn system from the end of the busway at Gilberton into the cross-city priority (bus) lanes on Grenfell Street. The project includes the creation of centrally aligned priority bus lanes along Hackney Road and a dedicated 670 metre bus tunnel from adjacent the National Wine Centre to near Grenfell Street, providing quicker, more reliable access for O-Bahn buses into the city.

McConnell Dowell Australia is the main works contractor for the O-Bahn City Access Project. Around 450 full time equivalent jobs are being created over the life of the project which is being conducted in line with South Australia’s Industry Participation Policy to provide important job opportunities for local South Australian businesses.

The O-Bahn City Access Project is scheduled for completion at the end of 2017.

For more information please:

Call the Project Information Line on 1300 443 198 or email the Project Team at

To register to receive project information and updates, complete the online feedback form here and check the Latest News & Publications page regularly.

View the concept visualisation:

The final design for the O-Bahn City Access Project reduced the impact of the tunnel on Rymill Park by extending the tunnel’s length and moving the tunnel portal 140 metres closer to Grenfell Street.

Once the tunnel is complete, Rymill Park (with the exception of the portion from the portal to Grenfell Street) will be revegetated.

Key to the landscape design philosophy is planting the area surrounding the southern portal with species that will screen the area as vegetation matures.

Landscape and urban design is an integral part of the project, which aims to recognise not only those people using the transport network but also those who live within its vicinity, as well as visitors wishing to access the Park Lands.

DPTI has worked closely with the City of Adelaide in finalising the landscape plans.

Southern Portal/East Terrace end, overlooking Rymill Park

Southern Portal looking west towards Grenfell Street

East Terrace and Rymill Park

Access to underground tunnel services building

Northern Portal on Hackney Road

Shared use path on western side of Hackney Road

Shared use pedestrian/cycle bridge across the River Torrens

*landscaping is shown at maturity

Project fast facts update (August 2017):

  • Excavation works for the tunnel are complete
  • 423 roof planks to form the 670 metre total length of tunnel have been completed.
  • Approximately 99% of the approximately 13 500 cubic metres of total concrete for the project has been placed.
  • A total of 571,000 construction hours have been worked to date.

To download a copy of the Project Fast Facts cick here [PDF,227KB]

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