Skip to main content
The new section of the North-South Motorway has now increased to 80km/h.

Regency Road Overpass installation update

Fri., 08 January, 2021

Monday 11 January:

The South Road and Regency Road intersection reopened to traffic ahead of schedule at approximately 9pm last night, following the completion of works to transport the centre spans for the Regency Road overpass bridge.

Sunday 10 January:

Today marks the last day of the major works to install the Regency Road overpass and associated infrastructure.

From 5am Monday, 11 January, the intersection will be opened, and traffic will resume to as it was prior to Monday, 4 January 2021.

Thursday 7 January:

The second centre span for the Regency Road overpass bridge has been transported into position from Polonia Reserve. Self-Propelled Modular Transporters (SPMTs) moved the overpass spans via remote controls, which contain detailed monitoring systems for each manoeuvre. A specialist driver managed the movement of the SPMTs.

The two bridge spans are 84m long and weigh 1300 tonnes each. They’re made up of 12 girder segments which were assembled off-site at the Polonia Reserve compound from mid-September 2020.

The SPMTs have completed similar scale bridge moves in SA and NSW recently, and have mobilised specifically from overseas for the R2P Project.

Installation of the first centre span for the Regency Road overpass

Installation of the first centre span and back spans for the Regency Road overpass

Wednesday 6 January:

The R2P Project installed a gantry along the North-South Motorway, near the Regency Oval. Gantries are the overhead structures used to support mounted Variable Message Signs, Lane Use Management Systems and Closed-Circuit Television (CCTV) (video security surveillance).

Installation of a road gantry and variable message sign along the North South Motorway

Installation of a road gantry and variable message sign along the North South Motorway

Tuesday, 5 January:

Today the R2P Project commenced installation of the northern back spans for the Regency Road overpass. They are installed using a 400 tonne crane, that sits on Regency Road. The spans have been fabricated by SA family-owned business Bowhill Engineering and will have precast concrete slabs installed on top of them that were cast by Bianco Precast.

Looking south over the South Road and Regency Road Intersection

The back spans ready to be installed

Monday, 4 January:

The first centre span has been transported from Polonia Reserve to its final location over Regency Road using Self-Propelled Modular Transporters (SPMTs), the same technology used to transport the Main South Road Bridge and Ayliffes Road Bridge for the Darlington Upgrade Project.

By constructing the bridge spans off-site and using SPMTs to install them, the impact on traffic is minimised and fewer road closures are required.

The SPMTs move at a speed of around 100 metres per hour. It is expected to take up to two days to transport both bridge spans and assemble them into place.

R2P SPMT on South Road at Polonia 4 January

R2P SPMT at intersection 4 January

R2P SPMT at intersection 4 January


  • The Department of Infrastructure, Regional Development and Cities is working with every Australian State and Territory to build much-needed infrastructure across a number of individual funding programs.

    Visit website
  • The Department works as part of the community to deliver effective planning policy, efficient transport, and valuable social and economic infrastructure.

    Visit website
  • McConnell Dowell is the Creative Construction Company for customers who want to build better communities through safe, smart, efficient infrastructure.

    Visit website
  • Mott MacDonald is an employee-owned management, engineering, and development consultancy with 16,000 staff in 150 countries.

    Visit website
  • An independent firm of designers, planners, engineers, consultants and technical specialists across all aspects of today's built environment.

    Visit website