Christchurch Southern Motorway
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| Route information | |
| Maintained by NZ Transport Agency | |
| Length: | 7.5 km (4.7 mi) |
| Existed: | 4 May 1981 – present |
| Major junctions | |
| East end: | Brougham Street  at Addington
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| To: | Halswell Junction Road at Hornby
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| Location | |
| Major cities: | Addington, Wigram, Hornby |
| Highway system | |
The Christchurch Southern Motorway is a motorway to the south-west of Christchurch, New Zealand linking the inner-city suburb of Addington, New Zealand to the southern Christchurch suburb of Hornby, New Zealand. The motorway is approximately 7.5 km long and is four-lane divided. The motorway forms part of State Highway 76.
The Christchurch Southern Motorway begins in the suburb of Addington at the western end of Brougham Street (at the Collins Street intersection), just south of the Christchurch CBD. It heads south-west, crossing Barrington Street (where there is an interchange) and Lincoln Road and passing to the south of Middleton. There is an interchange at Curletts Road, then the motorway heads through Wigram, passing under Aidanfield Drive and Awatea Road. The motorway ends at Halswell Junction Road to the south of Hornby.
Plans for a motorway network in Christchurch were first revealed in 1962, with the release of the Christchurch Master Transportation Plan. The Christchurch Southern Motorway, which formed a critical component of this plan, was proposed to run from Templeton to an interchange with the Christchurch Northern Motorway at Waltham, just south of the CBD. These plans were scaled back in 1975 so that the Southern Motorway would terminate into the western end of Brougham Street. The first section of the motorway, a short two-lane arterial, opened in 1981, linking Brougham Street with Curletts Road. Further motorway work was subsequently deferred due to slowing population and economic growth and a lack of funding.
Beginning in March 2010, the section between the Lincoln Road overbridge and Curletts Road was duplicated, and a new flyover was built linking the motorway directly to Brougham Street, creating a grade-separated junction with Barrington Street. The motorway was also extended from Curletts Road, where a new full interchange was built, to a new terminating roundabout at Halswell Junction Road, near the (upgraded) Springs Rd roundabout. A cycleway was built along the length of the motorway on both sides. The duplication and extension were officially opened on 14 December 2012. North of Springs Road, Halswell Junction Road was upgraded to form a two-lane undivided link from the motorway to State Highway 1 at Islington. This includes replacing the roundabout at Shands Road with traffic lights.
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