Transmission Gully Motorway and Porirua Link Roads

Transmission Gully motorway

Transmission Gully motorway is a four-lane 27km state highway currently being built from Linden to McKay's Crossing (north of Paekakariki) passing through the rural areas to the east of Porirua and Whitby. The motorway will provide a new route for State Highway 1 and will have connections to Porirua City's local roading system at Kenepuru Drive (near Bowland), Warspite Avenue (near Waitangirua Mall), the southern end of James Cook Drive and State Highway 58 just east of Pauatahanui.

The main Transmission Gully motorway and the connections to Kenepuru Drive and State Highway 58 are the responsibility of New Zealand Transport Agency (NZTA) and more information can be found on their website from the links below.

The connections to Waitangirua (Warspite Avenue) and Whitby (Navigation Drive and James Cook Drive) are via link roads that will be part of Porirua's local roads network and are the biggest investment the city has ever made (at an estimated cost of $33 million).

Design and construction of Porirua link roads

Construction of Porirua City's link roads is underway, with construction set to coincide with the opening of the Transmission Gully motorway in 2020. The two new link roads – the Waitangirua Link Road and the Whitby Link Road – will connect Porirua to the new motorway. The link roads will be built by CPB HEB, who are the contractors for the Transmission Gully motorway.

The Waitangirua and Whitby link roads shown on the map below will be part of the Council roading network, designed for a 50 kilometres per hour operating speed. They will have a 1.5 metre wide sealed shoulder on both sides for cyclists and a 3.3 metre verge on the side of the roads allows for a footpath to be built in the future.

Click to view full screen map showing link roads.
Click the image to view a close up large image in jpg format.

The 1.45 kilometre Whitby Link Road will connect to the existing roundabout at the intersection of Navigation and James Cook Drives. An estimated 3,200 vehicles will travel this road each day.

The 2.04 kilometre Waitangirua Link Road will intersect with Warspite Avenue and Niagara Street (near Waitangirua Mall) and be controlled by traffic signals. An estimated 4,900 vehicles will travel this road each day.

Benefits and effects of Porirua's link roads

  • The link roads will provide more efficient, safer and more reliable access from Wellington, the Hutt, Kapiti Coast and the lower North Island.
  • Traffic will be distributed across the network, with improved traffic flows, and the local community will benefit from reduced traffic volumes (especially commercial vehicles) travelling on the existing State Highway 1.
  • The new link roads will open up new areas of Porirua for residential and business growth.
  • The Waitangirua Link will reinforce the role of the Waitangirua Village Centre as a focus for activity in the suburb.
  • The Whitby Link will strengthen the roles of James Cook Drive and Navigation Drive.
  • There may be noise, dust and runoff effects during construction, which will need to be addressed by appropriate conditions of work.

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