Christchurch Northern Motorway
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| State Highway 1 | |
| Route information | |
| Maintained by NZ Transport Agency | |
| Length: | 10.2 km (6.3 mi) |
| Existed: | 16 October 1967 – present |
| Major junctions | |
| From: | Woodend |
State Highway 71  at Lineside Road |
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| To: | Belfast |
| Location | |
| Major cities: | Kaiapoi |
| Highway system | |
The Christchurch Northern Motorway is a motorway north of Christchurch, New Zealand, linking the northern Christchurch suburb of Belfast with Pineacres, between Woodend and Kaiapoi, bypassing the Kaiapoi area. The motorway is 10.2 kilometres (6.3 mi) in length, and is four-lane divided except for the two-lane undivided section between the Lineside Road/Smith Street interchange and the northern terminus. The motorway forms part of State Highway 1.
The Christchurch Northern Motorway begins in the suburb of Belfast at an intersection with Main North Road about 10 km north of the Christchurch CBD. For the first few kilometres it crosses the Waimakariri River and runs to the west of Kaiapoi with interchanges at Chaneys (with Main North Road), Tram Road and Ohoka Road. Approximately 7 km after the motorway begins is the Lineside Road interchange (providing access to Rangiora), where the motorway reduces to just two lanes undivided. The motorway ends further north at Pineacres, where it intersects with Main North Road again.
Plans for a motorway network in Christchurch were first revealed in 1962, with the release of the Christchurch Master Transportation Plan. Under this original plan the Northern Motorway was to run south from Chaneys, to the east of Belfast and Redwood and through Mairehau, St Albans and the CBD, to an interchange with the Christchurch Southern Motorway at Waltham.
In the late-1960s a section of the Northern Motorway was constructed north from Belfast to Pineacres, a distance of about 10 km. Plans for extending the motorway towards the city were scaled back in 1975 so that the Northern Motorway would terminate at the northern edge of the CBD at Bealey Avenue. In the mid-1990s, the motorway designation through St Albans was removed, with the planned extension now terminating at Queen Elizabeth II Drive.
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