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SH16 causeway widening begins

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Work will begin next week to upgrade the causeway on Auckland's Northwestern Motorway (State Highway 16) as part of the Western Ring Route road of national significance.

From Monday 6 May some temporary traffic management will be in place near the westbound onramp to State Highway 16.  Motorists, pedestrians and cyclists are being advised to drive with particular care while they adjust to the layout changes to the road and shared path.

The T2 lane westbound from Great North Road onto State Highway 16 will close to traffic for about two and a half years.  The shared path for pedestrians and cyclists which runs alongside State Highway 16 will be diverted gradually onto the T2 lane. 

The layout changes are to enable work to widen the causeway to begin and to ensure site workers are protected from motorway traffic close by. 

The Causeway Alliance - the NZ Transport Agency, Aecom, Coffey, Fulton Hogan, Leighton Contractors and Sinclair Knight Merz – is completing the $220m Causeway Upgrade Project.

Key features of the project include widening the motorway between the Whau River Bridge near Te Atatu and the Great North Road interchange to four lanes city-bound and four/five lanes westbound, extending the bus shoulder lanes, enhancing existing facilities for pedestrians and cyclists and raising the causeway 1.5m to stop flooding on the motorway during high tides.

“The Causeway Upgrade Project is big and complex, and we want to make sure that we do things properly from the start," says Tommy Parker, NZTA’s State Highways Manager for Auckland and Northland.

"Noise, traffic, lighting and environment management plans are in place, with Council approval for each one.  The plans will be closely monitored to ensure the Causeway Alliance operates within its permitted limits at all times."

The Causeway Upgrade Project is part of the Western Ring Route. Together with the neighbouring Waterview Connection project and upgrades of the Lincoln Road and Te Atatu Road interchanges on SH16, it will complete a 47 kilometre-long motorway alternative to SH1 and the Auckland Harbour Bridge. 

There will significant benefits for drivers when the Causeway Upgrade Project and other works linked to the Western Ring Route are completed, says Mr Parker.

“For the first time, there will be direct motorway access between the CBD and Auckland International Airport, and the Western Ring Route will also connect commuters and freight with the rapidly growing areas in the north-west and south west of the city.” 

Mr Parker says that the Western Ring Route will also benefit the Northland and Waikato/Bay of Plenty regions.

“It’s a key part of a massive investment in infrastructure in Northland and Waikato/Bay of Plenty needed to meet the demands of rapid economic and population growth underway in the top half of the North Island,” he says.  

For more information on about the project visit: www.nzta.govt.nz/sh16causeway(external link)

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