State Highway 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. SH 1 is 2,033 kilometres long, 1,081 km in the North Island and 952 km in the South Island. For the majority of its length it is a two-lane single carriageway, with at-grade intersections and property accesses, in both rural and urban areas. These sections have some passing lanes. Around 220 km of SH 1 is of motorway or expressway standard as of October 2017: 191 km in the North Island and 28 km in the South Island. Current road construction will see an extra 102 km in the North Island and 6 km in the South Island upgraded to motorway or expressway standard by 2022.
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