State Highway 16 Causeway Upgrade City Auckland Country New Zealand Client NZ Transport Agency Contract type Alliance Construction period May 2013 - December 2016 The fast lane to total mobility Economy: Leighton is widening a highway near Auck land by 2017. The causeway upgrade is a 4.5 kilome ter-long project between the Great North Road Inter change and the Te Atatu Interchange, and is a key component in completing the Western Ring Route road of national significance project. The existing six-lane causeway will be widened to provide additional lanes in both directions. Ecology: The causeway will be raised to prevent flooding during extreme tidal conditions, and stormwater will be treated to a higher standard before it is discharged into the Waitemata Harbour. The causeway runs be sides

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