New Zealand Transport Agency has completed the construction of the $340m Victoria Park Tunnel project three months ahead of schedule.

The project involved the building of three tunnels, which will increase the capacity of State Highway 1 between the Auckland Harbour Bridge and Newmarket.

The tunnel has been built 10m below ground and will stretch from St Mary’s Bay to Wellington Street and expected to be used by 55,000 to 60,000 vehicles every day.

The tunnel project is first of the New Zealand government’s seven Roads of National Significance to be completed.

The Victoria Park Tunnel project was carried out by an alliance comprising the NZ Transport Agency, Fletcher Construction, Beca, Higgins and Parsons Brinkenhoff.