New arterial road - West Kaiapoi

A new arterial road is to be constructed in west Kaiapoi to cater for ongoing development of land around the western side of Kaiapoi and will provide a key link to West Rangiora and Southbrook.

The road will extend from the Ohoka Road off-ramp and will curve around onto Butchers Road before joining back onto Island Road near Mill Road. The purpose of the road is to direct the through traffic away from the new residential area of Silverstream.

The road will address safety issues at the intersection at Ohoka Road/Island Road and Cosgrove Road. Improvements will be made at intersections along the new arterial road.

The new road will be two lane (one in each direction) and will involve the construction of two new bridges along the alignment.

In the future Island Road between Mill Road and Adderley Terrace will be closed to through traffic and the New Arterial Road will form the main link through to Kaiapoi.WDC10105_West-Kaiapoi-Arterial-Map

Project updates

Road layouts

View more details about improvements to intersections along the alignment of the new arterial road below.

Programme of work

All property purchase, detailed design and consenting has now been completed and physical works are now underway.

Road design

The new road alignment requires the reconfiguration of a number of intersections along the route. The proposed layouts of the intersections are shown on the map above. The road has been designed for a 70 km/h speed limit past the subdivision and a 100 km/h speed limit where the new arterial road joins back onto Island Road.


A tender has been awarded to HEB Construction Ltd for the physical works.

Work is programmed to begin on site on Wednesday 18 January 2017.

Hours of work shall be 7.30am to 6pm, Monday to Saturday. Some night work will be undertaken to help reduce the impact on road users. Residents will be notified in advance of night work being undertaken.

Traffic Impacts

  • Access to properties will be maintained during the work
  • If any access restrictions are required we will notify you in advance
  • Temporary traffic management will be in place during the work
  • Some aspects of the work may be undertaken as night work to reduce the impact to traffic. Advance notification will be provided.