The main Stephenson Avenue extension and its Mitchell Freeway interchange opened on 13 December 2025. The project’s remaining transport links followed in stages: the Stirling Bus Interchange was listed as open by 2026, and Main Roads WA said the final section of shared path opened in early September 2026. Finishing work and overnight closures were still listed in October 2026.
What opened, and when?
The headline’s “to open by September” timing is out of date. The main road connection opened on 13 December 2025, connecting Scarborough Beach Road and Flax Way with Cedric Street through a grade-separated interchange at Mitchell Freeway.
| Milestone | Status and date |
|---|---|
| Phase one | Delivered by the City of Stirling and opened in February 2022. City of Stirling |
| Phase two road connection and freeway interchange | Opened on 13 December 2025. Main Roads WA |
| Stirling Bus Interchange expansion | Listed as open by the state project page; the Public Transport Authority reports expansion from 18 to 29 stands. Government of WA Public Transport Authority |
| Final shared-path section | Main Roads reported it opened in early September 2026, connecting to the Mitchell Freeway Principal Shared Path. Main Roads WA |
Phase two is delivered by Main Roads WA. Alongside the principal road link, it includes local road connections, pedestrian and cycling links, changes to southern car park access, and the Stirling Bus Interchange expansion.
What changed for drivers?
The extension creates an east–west connection between Scarborough Beach Road and Cedric Street, with new Stephenson Avenue ramps at Mitchell Freeway. It also changes existing freeway access: the Cedric Street northbound off-ramp closed as part of the new arrangement. Check current route guidance and traffic updates before travelling, particularly while finishing works continue.
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How to access Stirling Station’s southern car park
Since Saturday 5 September 2026, drivers can enter and exit the southern car park from Cedric Street in both directions. The Stephenson Avenue entrance is left-in/left-out only; the temporary right-turn movement was removed. The Public Transport Authority advises passengers to follow signs at the station. PTA access information
What changed for buses, pedestrians and cyclists?
Bus interchange
The Stirling Bus Interchange increased from 18 to 29 stands, according to the Public Transport Authority. The PTA lists $90 million for the interchange upgrade; that figure refers to the interchange scope on its project page, not necessarily the whole Stephenson Avenue project. Public Transport Authority project page
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Shared paths and active travel
The final shared-path section, reported open in early September 2026, connects with the Mitchell Freeway Principal Shared Path. The wider phase-two works also provide pedestrian and cyclist connections through the project area. Main Roads WA project information
Will the extension reduce congestion?
Reducing traffic on Scarborough Beach Road and easing congestion are stated project aims. The City of Stirling says freed capacity could support future dedicated bus lanes and a mid-tier transport system. Those are intended benefits, not confirmation of measured results: the official pages cited here do not provide before-and-after travel-time or congestion data. City of Stirling Government of WA
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What has the project cost?
Agency pages publish figures for different project scopes. They should not be added together or treated as one agreed total cost without matching their definitions.
| Reported figure | What the source says |
|---|---|
| $461.4 million | Government of Western Australia lists this as the total project budget on its Building for Tomorrow page, accessed in 2026. Government of WA |
| $129 million from the WA Government and $129 million from the Federal Government | City of Stirling lists these as project funding commitments on its page updated in 2026. City of Stirling |
| $90 million | Public Transport Authority lists this for the Stirling Bus Interchange upgrade. Public Transport Authority |
| 800 jobs | Government of Western Australia lists this as jobs supported. Government of WA |
Check for current roadworks before travelling
Main Roads still listed overnight road closures and intermittent freeway works in October 2026. Closure times and locations can change, so consult the Main Roads project and traffic information for current conditions rather than relying on an old schedule.
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- Get more situational awareness with alerts for school zones, speed changes, sharp curves and more
- View food, fuel and rest areas along your active route, and see upcoming cities and milestones
- View Tripadvisor traveler ratings for top-rated restaurants, hotels and attractions to help you make the most of road trips
- Directory of U.S. national parks simplifies navigation to entrances, visitor centers and landmarks within the parks
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- Hands-free calling when paired with your compatible smartphone with BLUETOOTH technology and convenient Garmin voice assist lets you ask for directions to places you want to go
- Road trip–ready features include the HISTORY database of notable sites, a U.S. national parks directory, Tripadvisor traveler ratings and millions of Foursquare POIs
- Driver alerts for things such as school zones, sharp curves and speed changes help encourage safer driving and increase situational awareness
- Access live traffic, fuel prices, weather, parking and smart notifications when you pair this navigator with your compatible smartphone running the Garmin Drive app
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