The Transport and Main Roads Department (TMR) is preparing to shift Centenary Motorway southbound traffic onto the new bridge as part of the ongoing Centenary Bridge Upgrade, and that means temporary closures of the Sinnamon Road on and off ramps are imminent.
Read: Southbound Centenary Bridge Reconstruction Set to Begin in 2026
The closures, rolling out across two separate stages in March 2026, are necessary to allow southbound traffic to be moved onto the new bridge.
Member for Inala Jess Pugh announced the upcoming disruptions this week, urging motorists to plan their routes in advance and allow extra travel time.
Work Stages
The closures are being delivered in two distinct stages, each targeting a different ramp and affecting traffic in different directions.
Stage 1 — Northbound on-ramp closure
From 8pm Friday 6 March to 5am Monday 9 March 2026, the Sinnamon Road northbound on-ramp will be closed. Motorists will be detoured via the Mount Ommaney interchange at Dandenong Road. The southbound off-ramp remains open throughout this stage. Reduced speeds and intermittent overnight lane closures on the motorway are also scheduled, with traffic control and signage in place for the duration.
Stage 2 — Southbound off-ramp closure
From 8pm Sunday 15 March to 5am Friday 20 March 2026, the Sinnamon Road southbound off-ramp will be closed. Traffic will be diverted to the Seventeen Mile Rocks Road off-ramp. The northbound on-ramp will be open during this stage.
TMR has confirmed that traffic control will be in place and signage will guide motorists throughout both stages.
Read: $55-Million Lifeline to Get Centenary Bridge Back on Track
About the Centenary Bridge Upgrade
The ramp closures are part of a broader infrastructure project underway on the Centenary Motorway corridor. According to TMR, the Centenary Bridge Upgrade includes the construction of a new three-lane northbound bridge, which will also improve the on-ramp from Jindalee. Modifications to the existing structure will create a dedicated southbound bridge, also with three lanes, improving the off-ramp to Jindalee and incorporating active transport facilities.
The additional lanes across the bridges will enable further upgrades to the motorway in the future, according to TMR. Those future works form part of the broader Centenary Motorway Upgrade project — a program aimed at delivering greater capacity, efficiency, and travel-time reliability between Brisbane’s CBD and the western suburbs, between local destinations, and along the entire Centenary Motorway corridor.
Published 5-March-2026
