Project introduction

Waka Kotahi NZ Transport Agency has been investigating long-term improvements in the safety of SH1 between Cambridge (where the Waikato Expressway ends) and Piarere (at the SH1 and SH29 intersection).

  • Estimated project cost

    To be confirmed
  • Project type

    Road improvements
  • Project status

    In detailed business case development

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Purpose of the project

To investigate long-term improvements in the safety of SH1 between Cambridge and Piarere.


The detailed business case looking at the long-term strategic route between Cambridge and Piarere was put on hold for re-evaluation in 2018. Since then focus has been placed on works to prioritise safety and access on the existing state highway.

In January 2020, as part of the NZ Upgrade Programme, funding was approved for a new roundabout to be constructed in the vicinity of the existing SH1/SH29 intersection at Piarere. This roundabout will be on the alignment that forms part of any future extension of the Waikato Expressway from Cambridge to Piarere.

Read more about the NZ Upgrade Programme's SH1/SH29 intersection project 

The detailed business case for the Cambridge to Piarere corridor has also received funding to be completed this year. The earlier work is now being reviewed, updated and completed in order to ensure the NZ Upgrade Programme funded SH1/29 roundabout at Piarere is aligned with any future extensions of the Waikato Expressway. 

The layout and safety of other intersections along this corridor and the future provision for cycling and pedestrians is also being investigated as part of the detailed business case.

We do plan on bringing the results of this work to stakeholders and the community for their input as soon as we can.

No funding has currently been allocated for an extension of the expressway.

Short-term safety improvements

Safety improvements already completed on this section include:

  • Trimming vegetation and moving fences to improve visibility at Ferguson Gully Road.
  • New right-turn bay at Keeley Reserve.
  • Moving the Karapiro Road bus stop.
  • Moving the Karapiro School bus stop to a safer location.
  • Installing electronic warning signs at the SH1/SH29 intersection.

Waka Kotahi plans to continue to enhance safety improvements along the current SH1. The additional improvements will reduce the number of serious crashes and the impact of crashes if they do occur.

Information on safety improvements starting soon