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Adelaide's T2D Motorway Tackles Decades of Traffic Bottlenecks
State infrastructure work targets long-standing bottlenecks from Gawler to the southern suburbs.
How we reported this
The Department for Infrastructure and Transport is pressing ahead with the River Torrens to Darlington project to deliver a continuous 78 km motorway corridor from Gawler to Old Noarlunga. This follows years of incremental upgrades aimed at removing traffic lights and level crossings that have slowed movement across greater Adelaide.
Why the timing matters for daily commuters
Adelaide drivers have long dealt with stop-start conditions on key radial routes. The latest phase of work addresses those pain points by linking separate sections of freeway into one uninterrupted stretch. Officials say the approach grew out of earlier interchange and tram-separation jobs that proved the value of grade separation for both cars and public transport.
Local detail shows the pattern clearly. Earlier tram-grade projects in Plympton, Morphettville and Glandore replaced level crossings with overpasses and new stops. Similar logic now guides the South Eastern Freeway interchange upgrades at Mount Barker and Verdun, where extra ramps are intended to ease entry and exit for growing Hills traffic.
Evidence from current project lists
Site material from the department lists three headline projects that together target road, rail and safety outcomes. The T2D scheme sits at the centre, with the tram separations already complete and the freeway interchanges under way. A separate news item flags an upcoming upgrade to a busy western-suburbs intersection delivered as part of the same T2D package.
Parallel safety measures appear on the same homepage. July 2026 will bring a partial Glenelg tram-line closure for further works, while a public survey seeks feedback on personal-mobility-device and e-bike rules. Links to Traffic SA, THINK! Road Safety and Marine Safety SA sit alongside the project pages, showing how the department packages construction news with day-to-day travel information.
Residents planning trips in coming months can check the Traffic SA site for live updates on lane closures and detour routes. The department also maintains outback-road warnings and marine webcams for those travelling beyond the metro area.