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State Highway 1 (SH 1) is the longest and most significant road in the New Zealand road network, running the length of both main islands.It appears on road maps as SH 1 and on road signs as a white number 1 on a red shield, but it has the official designations SH 1N in the North Island, SH 1S in the South Island.
Transmission Gully Motorway, Pāuatahanui exit. A highway connecting the Kāpiti Coast to Pāuatahanui through the Wainui Saddle was first proposed in 1919 by William Hughes Field, the MP for Ōtaki at the time, as one of two alternatives to the steep, narrow and windy Paekakariki Hill Road between Paekākāriki and Pāuatahanui. [4]
The southern end linked SH 1 just north of Paekākāriki to with a two-lane highway towards Porirua City eventually linking with the four-lane Johnsonville–Porirua Motorway which was constructed in the 1950s. The northern end linked to the existing two-lane SH 1 from Peka Peka north towards Otaki, Levin and beyond.
Of the total state highway network, New Zealand currently has 363 km (226 mi) of motorways and expressways with grade-separated access and they carry ten percent of all New Zealand traffic. The majority of the state highway network is made up of single-carriageway roads with one lane each way and at-grade access.
The Dunedin Southern Motorway is the main arterial route south from the South Island city of Dunedin, part of New Zealand's State Highway 1. Despite its name, only a portion of the route is officially classified as motorway. The route is the southernmost section of median-divided highway in the world.
The Christchurch Northern Motorway is the main northern route into and out of Christchurch, New Zealand. The motorway forms part of State Highway 1 (SH 1) and State Highway 74 (SH 74). The motorway, which heads in a northerly direction, is approximately 16.5 km in length.
The Ngauranga Gorge is in the Wellington Region of New Zealand. State Highway 1 runs through the gorge, a vital link between central Wellington City and its northern suburbs and Porirua City and the Kāpiti Coast; it is the main route north out of Wellington. It is 2 kilometres (1.2 mi) long and has a grade of approximately 8 percent.
In 2016 the Wellington Urban Motorway, along with State Highway 1 to Johnsonville and State Highway 2 to Petone, became New Zealand's first 'smart motorway'. [25] Speed limits are adjusted automatically according to the amount of traffic on the road, with the aim of smoothing out the flow of traffic. [26]