The New Zealand Transport Agency (NZTA) NZTA and its alliance partners - Leighton Contractors, Fulton Hogan, VSL, URS, BECA, Tonkin & Taylor and Boffa Miskell - are constructing a new viaduct and removing the old one in stages.  Southbound motorway traffic was moved off the old bridge in September 2010.

The old bridge on Auckland's southern motorway was cut into pieces, which were then lowered to the ground with the help of the projects’s ‘Big Blue’ lifting gantry, clearing the way to complete construction of the new northbound lanes in its place. Already, 23 of its 234 segments needed for the new bridge are in position.

Northbound traffic is scheduled to move onto the new structure in the first quarter of 2012.
“We’re making great progress replacing the old viaduct while keeping open the country’s busiest section of motorway right next to construction site,” said NZTA’s state highways manager for Auckland and Northland, Tommy Parker.