Johnsonville–Porirua Motorway

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State Highway 1 NZ.svg

Johnsonville–Porirua Motorway
State Highway 1
Route information
Maintained by New Zealand Transport Agency
Length: 11 km (7 mi)
Existed: 23 December 1950 – present
Major junctions
North end: Porirua
South end: Johnsonville
Tawa, Churton Park, Grenada North
Highway system

The Johnsonville–Porirua Motorway is a motorway in Wellington, New Zealand. It forms part of State Highway 1, the main route of traffic in and out of the city.

The motorway runs from Johnsonville, in the north of Wellington City proper, to Porirua. It is approximately 11 kilometres long, and mostly flat. At its southern end, it is connected to the Wellington Urban Motorway through Ngauranga Gorge — this connection is not considered motorway, meeting most but not all of the criteria. When the Transmission Gully Motorway is built, it would connect to the Johnsonville–Porirua Motorway near its northern end.

The first section of the motorway, running for three miles (5 km) from Johnsonville to Takapau Road at the southern edge of Tawa, was opened on Saturday 23 December 1950 .[1][2] It bypassed a winding two-lane road now called Middleton Road, through Glenside. It was New Zealand's first motorway,[3] with much of the section between Johnsonville and Tawa using the former alignment of the North Island Main Trunk railway built in the 1880s by the Wellington and Manawatu Railway Company and bypassed by the Tawa Flat deviation built in the 1930s.

Exit list[edit]

Territorial authority Location Destinations Notes
Terminates onto State Highway 1 at Mungavin Ave - Titahi Bay Road interchange
Porirua City Porirua CBD Porirua City Centre, Eastern Porirua, Titahi Bay, Kenepuru
Wellington City Redwood Tawa, Grenada North
Glenside Churton Park
North of Johnsonville Johnsonville, Khandallah southbound exit only
South of Johnsonville Johnsonville, Khandallah northbound exit only
Top of Ngauranga Gorge Newlands, Woodridge, Grenada Village
Terminates onto Centennial Highway at the top of the Ngauranga Gorge

See also[edit]


  1. ^ AJHR D1, 1951 page 29
  2. ^ Dominion 27 December 1950 page 11; Evening Post 21 December 1950 page 6, 27 December 1950 page 10 (photos)
  3. ^ Transit New Zealand - FAQ