Johnsonville–Porirua Motorway
The Johnsonville–Porirua Motorway is a motorway in Wellington, New Zealand. The majority of the motorway forms part of State Highway 1, the main route of traffic in and out of the city, with the northernmost 2.1 km (1.3 mi), formerly part of SH 1 until 7 December 2021, designated as State Highway 59. Completed in the 1950s, it was New Zealand's first motorway.
Johnsonville–Porirua Motorway | |
|---|---|
| State Highway 1 / State Highway 59 | |
| Route information | |
| Length | 11 km (6.8 mi) |
| Existed | 23 December 1950–present |
| Major junctions | |
| North end | Porirua |
| South end | Johnsonville |
| Location | |
| Country | New Zealand |
| Primary destinations | Tawa, Churton Park, Grenada North |
| Highway system | |
| |
The motorway runs from Johnsonville, in the north of Wellington City proper, to Porirua. It is approximately 11 kilometres long with moderate grades. At its southern end, it connects to the Wellington Urban Motorway through the Johnsonville bypass and Centennial Highway, which runs along Ngauranga Gorge — Centennial Highway is not considered motorway, meeting most but not all of the criteria. The motorway has a connection to the Transmission Gully Motorway in Linden, 2.1 km (1.3 mi) from its northern end.