Well-Connected Alliance


Contract Type



Nov 2016



Waterview Connection tunnels and road barriers

Keeping drivers safe in New Zealand’s longest road tunnel

Seovic’s slip-form barriers will protect drivers in the Waterview Connection tunnels when the new motorway opens in early 2017. The barriers, which run along both sides of the twin 2.4km tunnels, redirect cars which have lost control before they crash into and damage the tunnel walls.

The barriers...redirect cars which have lost control before they crash into and damage the tunnel walls.

Seovic installed 9,270 lineal metres of TL-4 F-shape barriers along the tunnel walls, using 4,500m3 of concrete from Firth. The walls were poured and formed on site in their final position using Seovic’s slip-form machinery. 
With multiple trades working concurrently in the tunnels to complete the mechanical and electrical fitout and commissioning, the slip-form process was a significant advantage, enabling the barriers to be installed considerably faster than alternative methods. 

Seovic also constructed 10km of TL-4 and TL-5 roadside and median barriers for the motorway walks on SH16 (Northwestern motorway) and SH20 (Southwestern motorway).

The $1.4 billion NZ Transport Agency Waterview Connection project connects the SH20 and SH16 Motorways in Auckland to complete the city's Western Ring Route.  


Project Partners

Name The New Zealand Transport Agency

Role Owner and Alliance Participant

Name Tonkin + Taylor

Role Alliance Participant

Name Beca

Role Alliance Participant

Name McConnell Dowell Constructors

Role Alliance Participant

Name Obayashi Corporation

Role Alliance Participant