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The Project

The O-Bahn City Access 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.

From the current O-Bahn exit point at Gilberton, buses will continue via centrally aligned priority bus lanes along Hackney Road.  In addition to the priority bus lanes, two traffic lanes and bicycle connectivity in each direction will be maintained.

A dedicated bus tunnel is being constructed to take buses below the Botanic Road and North Terrace intersection. The priority bus lanes pass under the Park Lands and Rundle Road along the same route as the old tramway embankment, returning to grade near the East Terrace, Grenfell Street intersection.

Rundle Road and East Terrace will be reconfigured to deliver pedestrian, cycling and vehicle improvements. A shared pedestrian/cycling path will be provided on the western side of Hackney Road between Bundeys Road and Botanic Road and will include a new shared use pedestrian/cycling bridge over the River Torrens.


The O-Bahn to Paradise opened on 9 March 1986 and to Tea Tree Plaza on 20 August 1989.

It is the most highly patronised public transport corridor in the metropolitan area.

The on-road section of the O-Bahn corridor between Gilberton and Adelaide’s Central Business District (CBD) currently has limited measures to protect public transport services from the effects of road congestion. This congestion impacts on bus services by increasing travel times and increasing the variability of on-time running. Vehicle movements at the Hackney Road/Botanic Road intersection are currently at or approaching capacity, with around 79,000 vehicle movements on an average weekday. Without further intervention, delays currently experienced on this section of the O-Bahn system will increase.

The project will make an important contribution to enhancing the sustainability of our city and improving its liveability.

Key Benefits

  • Improved travel time and reliability for O-Bahn bus services
  • Reduced traffic congestion on the Inner Ring Route
  • Improvements to traffic safety
  • Improvements to pedestrian and cycling access and safety
  • Improving the East End business precinct
  • Improved amenity along East Terrace and Frome Road

The benefits obtained by the successful delivery of this project will contribute to achieving the goals contained within the State Government’s Integrated Transport and Land Use Plan (ITLUP), which identified the need “to improve O-Bahn access to the Adelaide City Centre” as a priority. This improvement to public transport infrastructure also aligns with the State Government’s South Australian Strategic Plan targets, in particular to increase the use of public transport to 10% of metropolitan weekday passenger vehicle kilometres travelled by 2018.


Construction works have been carefully scheduled to minimise impacts as much as possible.

Further information about timing is regularly provided to commuters, local community members and registered stakeholders in advance of these activities commencing.

Construction program overview


- Construction of centrally aligned priority bus lanes between Richmond Street and Hackney Road/Botanic Road intersection

- East Terrace realignment open to traffic and road surfacing completed

- Botanic Gardens car parks (final landscaping and lighting works expected to be completed late in the second quarter of 2017)

- Last sections of roof over the tunnel on Hackney Road installed

In progress till late second quarter of 2017

- New shared use pedestrian/cycle bridge across the River Torrens

- Hackney Bridge widening works

In progress till late second quarter of 2017- Park Road widening and changes to the Hackney Road / Bundeys Road intersection for the outbound priority bus lane
Late second quarter of 2017

- Extension of the Plane Tree Drive U-turn slip lane

- Reopening of the Linear Park paths under Hackney Bridge

In progress till mid-2017 - Backfilling of tunnel within Rymill and Rundle Parks
Mid 2017 - Reinstatement of fountain near East Terrace
Mid 2017 till last quarter of 2017

- Eastern service road improvements including landscaping

- Construction of the Botanic Gardens Plaza located in front of the Tram Barn and Goodman Building on Hackney Road

In progress till third quarter of 2017 - Construction of the new shared use path between the River Torrens and Hackney Road /Botanic Road intersection
In progress till third quarter of 2017

- Hackney Road rehabilitation works (road resurfacing) night works

- Tunnel civil construction

Early third quarter of 2017 - Implementation of the right turn restriction from Hackney Road to Park Terrace during peak times
Third quarter of 2017 - Construction of the outbound priority bus lane from just south of Richmond Street up to the Gilberton entry
Third quarter of 2017 - U-turn facility to be installed between the tunnel portal and the intersection of Hackney Road and Botanic Road
Third quarter of 2017 - Lifting of right turn restrictions at the intersection of Hackney Road / Botanic Road / North Terrace / Dequetteville Terrace and reinstatement of all lanes on Hackney Road and Dequetteville Terrace
Last quarter of 2017 - Installation of urban design elements for the portal, including landscaping
Last quarter of 2017 - East Terrace and Rundle Road rehabilitation and upgrade works
End of 2017 - Reinstatement of parking on the eastern side of Hackney Road and Dequetteville Terrace between north of Botanic Street and Little Rundle Street with peak period weekday restrictions
End of 2017

- Complete tunnel testing and commissioning

- Complete operational testing

Note: All timing is indicative and is subject to change throughout construction