The new motorway will extend from the Christchurch Southern Motorway Stage 1 at Halswell Junction Road and travelling through 'greenfields' (rural land) to near Robinsons Road on State Highway 1 (approximately 7.5km in length). The motorway will bypass the existing built-up areas of Templeton and Hornby, reducing traffic and congestion in these areas and improving safety. As part of this project Main South Road will be four laned from near Robinsons Road and ending just before Rolleston (approximately 5km in length).
This new road will be built to motorway standard and have two lanes in each direction and oncoming traffic will be separated by a central median and barrier. A full access interchange at Springs Road and city bound on and off ramps at Halswell Junction Road will provide access to the motorway. A full grade separated interchange (flyover, with on-ramps and off-ramps) at the Weedons Road intersection will be constructed as a key access to Rolleston, the Izone Industrial Park and the surrounding area.