Mt Ousley Interchange work ramps up while everyone else sleeps

More than 1000 people worked during the night closures of the M1 Princes Motorway for early construction on the Mt Ousley Interchange.

The first round of multiple night closures for the project was completed in late December.

Transport for NSW senior project manager Warren Blacka said more than 12,600 hours were worked during the multiple night closures, as major construction officially kicked off.

“Crews maximised the use of the limited time available to carry out tasks that can only be done during full closures of the M1 Motorway to ensure the safety of workers and road users,” Mr Blacka said.

“The M1 Motorway is a busy and key corridor for vehicles between Sydney and the South Coast.

“The Mt Ousley interchange is a significant road infrastructure project that will improve safety and access for the 50,000 motorists travelling through Mount Ousley.

“More than 20 different types of heavy machinery were used, with all hands on deck to allow for significant progress to be made.

“Work included installing 32 temporary street lights, installing 1400 metres of barriers and placing 1100 tonnes of asphalt.

Take a look at the work completed during the multiple night closures of the M1 Princes Motorway in November and December 2024.

“Twenty-two noise panels were removed along Dumfries Avenue to allow work to start on the new five-metre-high noise wall in this area, which is expected to be complete in 2025.

“An acoustically designed temporary noise wall has been built to provide some reduction in noise from the road until the new noise wall is complete.”

Mr Blacka said work carried out during the closures had prepared the site for major excavation work to start in the new year.

“Next year, construction will also begin on the first of two new heavy-vehicle safety ramps. Construction of the first ramp is expected to be complete by mid-2025, weather permitting,” he said.

“The community will see work begin on the three new bridges that are to be built as part of the project, with the construction of the supporting structures expected to start in 2025.

“Work will also include vegetation removal on the southern side of the M1 Princes Motorway, continued work on the new five-metre-high noise wall along Dumfries Avenue, and relocation of utilities.”

However, the pedestrian bridge over the M1 Princes Motorway at Northfields Avenue will remain closed longer than expected.

Transport for NSW had hoped to complete temporary access to the bridge in December, but has pushed it back until work on the site resumes in early January.

A signposted detour is in place via the University Avenue bridge.

Click here for more information on the Mount Ousley Interchange project. During the site closure, the project information line will be available for any emergencies or urgent inquiries – phone 1800 792 918.