As officials prepare to review the latest in a series of reports spanning twenty-three years regarding the Additional Waitematā Harbour Crossing, a new proposal has emerged that suggests a multi-modal bridge as an alternative to the extensive motorway tunnel designs that have dominated planning discussions since 2003.
Nicolas Reid, Technical Director of Public Transport and Rapid Transit at MRCagney, has presented a plan for a six-lane cable-stayed bridge situated to the east of the current Auckland Harbour Bridge. The proposal aims to address missing transport functionality while offering a potentially lower-cost and faster delivery timeline than previous tunnel-based schemes.
The design focuses on balancing lane capacity across the harbour and separating city-bound commuter traffic from motorway through-traffic. By integrating rapid transit, bus lanes and active transport paths for cyclists and pedestrians, the project seeks to move beyond vehicle-only capacity constraints. The structure is intended to work in tandem with the existing bridge, providing a more resilient network capable of managing lane closures without the need for the current movable barrier system.
Did You Know? The proposed bridge would feature a 43m clearance above high tide sea level, matching the current Auckland Harbour Bridge, while utilizing longer approaches to ensure a less steep incline for transit.
Expert Insight: The significance of this proposal lies in its focus on “offline” construction. By avoiding major modifications to the Central Motorway Junction and circumventing the need for extensive new motorway interchanges or deep-bore tunnelling, the project attempts to mitigate the high-cost, high-disruption pitfalls often associated with major infrastructure works. However, the ultimate viability of such a project remains subject to the upcoming deliberations of the Cabinet and the broader objectives of the 30-year Integrated Transport Plan.
The project, estimated to cost less than $6 billion, would connect the old toll plaza area north of the Onewa interchange to the Victoria Park viaduct. This alignment is designed to link points where existing transport networks already possess surplus capacity. The plan includes a seaward side embankment from Akoranga to Onewa to accommodate a busway extension, which proponents note could also serve as protection against storm surge flooding.
Looking ahead, the Cabinet is expected to consider a business case for the crossing. While previous iterations have leaned toward tunnel-heavy designs, this bridge-based alternative may influence the ongoing public and political debate regarding the city’s long-term transport infrastructure. Future stages of the proposed rapid transit lanes could potentially support light rail or metro systems, depending on future network decisions.
Frequently Asked Questions
What are the primary transport benefits of the proposed bridge? The proposal aims to separate motorway and local traffic, add rapid transit and bus lanes, and provide dedicated walking and cycling paths. It also adds counter-peak capacity and provides resilience for maintenance closures.
How would the new bridge impact the existing harbour bridge? The movable barrier system on the existing bridge would be removed. The combined system would allow for full peak capacity of five traffic lanes in both directions simultaneously, with the central span of the existing bridge dedicated to northbound traffic.
Why is this proposal considered more affordable than other options? The proposal avoids major tunnelling, modifications to the Central Motorway Junction, and the construction of new large-scale motorway interchanges. It relies on standard construction methods and leverages existing network connections.
How should the city prioritize its transport investments to best serve the needs of all Aucklanders?
