The next task is to fill the 1.5m-wide gap between the new northern and southern viaducts to make one complete structure.  The two viaducts will be concreted together during the weekend of 3 and 4 December in an 18 hour-long operation known as ‘the stitch’.

A total of 234 concrete segments, each weighing an average of 70 tonnes, have now been lifted into position to construct the new northbound viaduct on Auckland's southern motorway.

NZTA and its partners - Leighton Contractors, Fulton Hogan, VSL, URS, BECA, Tonkin & Taylor and Boffa Miskell - are constructing the new viaduct and removing the original 1965 structure in stages while the motorway remains open.