Te Aranui o Te Rangihaeata – Transmission Gully motorway forms part of SH1. The road continues to provide important regional resilience and a safe, modern, reliable route to and from Wellington. It opened in March 2022.
Transmission Gully is part of State Highway 1, and provides important regional resilience and a safe, modern, reliable route to and from Te Upoko o te Ika a Maui – Wellington.
It is one of the largest transport infrastructure projects in New Zealand and was the first motorway to be constructed on behalf of the Government under a Public Private Partnership (PPP) contract. The Government’s PPP contract is with Wellington Gateway Partnership.
27 kilometre-long motorway with central median barriers, two lanes in each direction and additional crawler lanes on the steeper sections.
Better resilience to landslides, floods and damage to the motorway from a major storm or earthquake, plus quicker reinstatement than State Highway 59 (old SH1) in the event of a major earthquake.
Improved average peak travel times (estimated at around 10 minutes per vehicle for Kāpiti to/from Wellington, 15 minutes Kāpiti to/from the Hutt Valley and five to seven minutes quicker from Porirua to/from the Hutt Valley).
Improved access from State Highway 1 to Porirua and the Hutt Valley, with shorter and more efficient freight movements to and from Seaview/Gracefield, Wingate and the Wairarapa.
Important arterial connections for residential and light commercial areas in eastern Porirua to the State Highway network through two new link roads.
An alternative strategic link for the Wellington region, which has improved regional road network security.
