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New Zealand State Highway network

The New Zealand State Highway network is the major national highway network in New Zealand. Just under 100 roads in both the North and South Islands are State Highways. All state highways are administered by Transit New Zealand.

The highways were originally designated using a two-tier system, national (SH 1-8) and provincial, with national highways having a higher standard and funding priorities. Now all are state highways, and the network consists of SH 1 running the length of both islands, SH 2-5 and 10-58 in the North Island, and SH 6-8 and 60-99 in the South Island, numbered approximately north to south. State highways are marked by red shield-shaped signs with white numbering (shields for the former provincial highways were blue). Road maps usually number state highways in this fashion.

Only three percent of the network is composed of dual carriageway motorways and expressways with grade-separated access. The majority of the State Highway network is single carriageway with at-grade access.

History

In the early days all roads were managed by local roads boards. The idea of a national network of highways did not emerge until the early twentieth century, when a series of pieces of legislation was passed to allow for the designation of main highways (in 1922) and state highways (in 1936). This saw the National Roads Board, an arm of the Ministry of Works, responsible for the state highway network.

Since 1989, state highways have been the responsibility of Transit New Zealand, a Crown entity. In 1996 the funding of the network was removed from the operational functions with the creation of Transfund New Zealand, which has since merged with the Land Transport Safety Authority to create Land Transport New Zealand. This is intended to ensure that funding of state highways is considered on a similar basis to funding for local roads and regional council subsidised public transport. However, the functions of the two government departments are to be merged again in the near future.

Every five years Transit New Zealand embarks on a state highway review, which considered whether the existing network should be expanded or reduced, according to traffic flows, changes in industry, tourism and development. Highways around Tauranga and in the Napier/Hastings region have undergone major changes in recent years.

Distance markers

State highways are marked with posts at irregular intervals giving the distance in kilometres from the start of the highway. Until recently, all bridges on the network had at each end a small plaque showing the distance from the start of the highway, usually in the form of a number in kilometres, an oblique stroke, and a further number in kilometres, accurate to the nearest 10 metres. A plaque marked 237/14.12, for example, indicated that the bridge was 14.12 km past a set distance post, that post being 237 km from the start of the highway. In about 2004 these plaques were replaced by a new system, which gives each bridge a single number showing the distance from the start of the highway in hundreds of metres. Under the new system the bridge above would be numbered 2511, as it is 251.1 km from the start of the highway. Motorway on- and off-ramps are numbered using the same system.

In this way, travellers can accurately assess their location, and road authorities can identify each bridge uniquely.

Sometimes, houses with RAPID numbering can also be used to determine the position. For example, house number 31530 is 315.3 km from the start of the highway.

Volumes

From 2006 information, the busiest stretch of SH 1 was just south of the Auckland Central Motorway Junction, on/near the Newmarket Viaduct, with over 200,000 vehicles (either way) each day. The least busy parts of the network (excluding off-ramps and on-ramps) are on SH 43 north-east of Whangamomona, with fewer than 120 vehicles (counting both directions) in a day . Some of the lesser trafficked highways still include unsealed sections.

Safety

In early 2008, Transit New Zealand unveiled KiwiRAP (the New Zealand Road Assessment Programme) in cooperation with other government agencies and the Automobile Association of New Zealand. The system, based on similar programs overseas, categorises New Zealand state highways according to the safety of discrete 'links' (sections of the network, with a total of 10,856 km of highways separated into 172 links ranging in length from 2.4 km to 318 km). These are graded according to their 'individual risk' and their 'collective risk' based on historical crash data and traffic volumes.

  • The individual risk is based on the likelihood of a single driver experiencing an accident while travelling the link in question. As of 2008, the three least safe sections of the network based on individual risk were State Highway 62 from Spring Creek to Renwick (Marlborough), State Highway 37 to Waitomo Caves and State Highway 94 from Te Anau to Milford Sound.
  • The collective risk is based on the total amount of crashes that occurred on the link, which pushes somewhat safer, but very highly travelled sections of the network to the top of the statistical category. As of 2008, the three least safe sections of the network based on collective risk were all on State Highway 2, on the sections from Napier to Hastings, Mount Maunganui to Paengaroa and Bay View to Napier.

Both categories of assessment are to be used as an advisory tool for both drivers to inform them of dangerous road sections as well as to allow Traffic Controlling Authorities to prioritise maintenance and safety improvements.

Specific sections

State Highway 1

State Highway 1 can be considered as a single highway running the length of both main islands, broken in the middle by the ferry connection at Cook Strait. It connects the five largest urban areas and includes the country's busiest stretch of road.

Touring routes

Many sections of State Highway provided by Transit New Zealand are marketed as tourist highways, sometimes jointly with local roading providers. Transit maintains traffic signs on and near State Highways to help promote these routes. These include:

See also

References

External links

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