Fast facts

Status

Works underway.

Location

Mount Barker.

Funding

Funded by Australian and South Australian governments (80:20).

About the project

The existing Mount Barker Interchange will be upgraded to include a new three-lane bridge across the South Eastern Freeway for northbound traffic, with the existing bridge converted to accommodate three lanes of southbound traffic and a new Shared Use Path. It will also include improved ramp capacity and new traffic signals to improve safety and reduce congestion.

Mount Barker is currently a major growth area in the Adelaide Hills.

The current Mount Barker Interchange is subject to significant congestion and queuing, with 43 crashes reported between 2019 and 2023. Upgrading this interchange will improve capacity, traffic efficiency and commuter safety in the area.

These works are part of the South Eastern Freeway Interchanges upgrades.

Construction at the Mount Barker Interchange started in late 2025. The interchange is expected to be open to traffic in late 2027.

What's happening

Key features include:

• a new three lane bridge over the South Eastern Freeway for northbound traffic
• conversion of the existing bridge to accommodate three lanes of southbound traffic
• a new signalised intersection at Adelaide Road and the freeway exit ramp from Murray Bridge
• upgrades to the existing ramps to and from Adelaide to improve safety and capacity
• a new bus priority lane
• a new shared use path
• a new northbound on road bike lane
• improved accessibility and safety for Adelaide Road service road.

Concept design gallery

Concept image showing section for upgrade.

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Contact

Engagement Team

• DIT.Engagement@sa.gov.au
• 1300 794 880