Thompson Road and Mornington Peninsula Freeway Interchange Upgrade

Overview

We’re upgrading the Thompson Road and Mornington Peninsula Freeway interchange in Patterson Lakes to improve safety and traffic flow.

The project will upgrade the western side of the interchange to:

• install traffic lights
• add a second right-turn lane from Thompson Road to the Mornington Peninsula Freeway city-bound entry ramp and from the Mornington Peninsula Freeway city-bound exit ramp to Thompson Road
• realign the left-turn lane from the Mornington Peninsula Freeway city-bound exit ramp to Thompson Road and from Thompson Road to the Mornington Peninsula Freeway city-bound entry ramp.

Next steps

The upgrade is now in the pre-construction phase. Key activities include:

• on-site investigations, including identifying underground utilities, and assessing potential impacts to flora and fauna
• refining the project design and construction approach
• securing planning and environmental approvals.

Once we have progressed these key activities, the project will enter the procurement phase to appoint a construction partner to deliver the upgrade.

Construction timelines will be confirmed once pre-construction has progressed further.

Community feedback

From 10 November to 30 November 2025, we asked for community feedback to help inform our planning. Thank you to everyone who took the time to provide feedback.

1,561 responses were received to our polls, 125 comments were provided on our interactive map, and 140 people attended our community pop-up.

Feedback has provided important local insights that have helped us to understand community views on safety, traffic flow and what we should consider in our planning.

• Feedback showed strong community support for improvements to the western side of the interchange, particularly to make access to and from the freeway safer and easier.
• When asked which improvement they most wanted to see, respondents identified improved intersection control (installing traffic lights or a roundabout) as the top priority, followed by additional or extended turning lanes.
• Difficulties were noted when turning right onto the freeway from Thompson Road, and when turning right onto Thompson Road from the freeway exit, due to high traffic volumes and limited gaps in the traffic.
• Safety concerns were also raised around poor visibility when exiting the freeway and turning left onto Thompson Road.

For further information on what you’ve said, view the Community Consultation Report (PDF, 1.3 MB).

Site investigations

To help inform our planning, we’ll complete site investigations. At times, we may need to implement traffic control measures, including temporary lane closures, stop/slow traffic and reduced speeds. We’ll keep traffic disruption to a minimum and avoid busy periods.