Johnsonville-Porirua Motorway
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|---|---|
| State Highway 1 | |
| Route information | |
| Maintained by NZ Transport Agency | |
| Length: | 11 km (7 mi) |
| Existed: | 23 December 1950 – present |
| Major junctions | |
| North end: | Porirua |
| South end: | Johnsonville |
| Location | |
| Primary destinations: |
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. Completed in the 1950s, it was New Zealand's first motorway.
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 Ngauranga Gorge — Ngauranga Gorge is not considered motorway, meeting most but not all of the criteria.
When the Transmission Gully Motorway is completed, it will connect to the Johnsonville–Porirua Motorway at Linden, near its northern end.
The motorway was constructed using the cut and fill technique where material removed from cuttings is used to fill gullies. Some additional material was needed and excavated in Linden from the area that is now the northern of the Tawa College playing fields to the east of the motorway.
The first section of the motorway, running for three miles (5 km) from Johnsonville to Takapu Road at the southern edge of Tawa, was opened on Saturday 23 December 1950. It bypassed a winding two-lane road now called Middleton Road, through Glenside. This section was New Zealand's first motorway. The southern end of the motorway was located at the point where the Johnsonville northbound on-ramp and southbound off-ramp meet the current motorway. The northern end was located at the point where the Takapu Road northbound off-ramp and southbound on-ramp meet the present motorway.
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