Safety will be improved at State Highway 1 and State Highway 29 at Piarere with construction of a new roundabout to replace the existing T-intersection.
In January 2020 funding was approved to upgrade the intersection of SH1 and SH29 at Piarere. This will improve efficiency, connectivity and safety on a high-volume traffic route, which is one of New Zealand’s most critical corridors. The new roundabout is designed to allow connection with the future expressway between Cambridge and Piarere.
SH1 Cambridge to Piarere project
Auckland, Waikato and the Bay of Plenty are part of the Upper North Island’s Golden Triangle, home to more than half of New Zealand’s population. The transport corridors in these regions are critical to support the safe travel of a growing number of visitors and residents, and to get goods to market efficiently.
SH1 between Cambridge and Piarere is part of the key journeys which link Auckland and Hamilton with Tauranga, specifically the Port of Tauranga via SH29, as well as central and lower North Island via SH1.
The new intersection roundabout layout will:
The existing T-intersection is high-risk. Between 1 December 2015 and 30 November 2020, there were 21 crashes within 50m of the T-intersection resulting in 2 fatalities, and 12 crashes involving injuries. The high number of crashes reflects risks taken by road users responding to the intersection layout.
CloseRoundabouts and grade-separated interchanges such as flyovers or slip lanes are valid options for traffic flow and safety but there are important reasons why a roundabout was chosen for this intersection.
A roundabout in this area is the safer option as everyone, whichever direction they approach from, is in a slower speed environment whatever the time of day or night.
Good roundabout design provides equal access and manages energy if a collision does occur, therefore minimising severe injury.
When required, the roundabout will readily connect to the future Cambridge to Piarere expressway.
Having a roundabout at the end of the expressway will signal to drivers that there’s a significant change in the road environment. It will help travellers slow down, assess directions and traffic conditions and adjust their driving from a high-speed expressway back into a 2-lane rural highway.
CloseAfter 18 months of construction, the bulk of the work on the SH1/29 roundabout and approach roads is complete and the speed limit in the area has been lifted to 100km/h.
The project is on track to be completed in late August 2025.
People will continue to see activity over the remaining weeks, including landscaping (around 200,000 plants will be in by the end of July) and finishing touches to the underpasses.
NZTA thanks motorists for their patience throughout this project.
If you have any questions or comments, please email us at C2P@nzta.govt.nz (Please note this email address is only monitored during business hours).
You can also write to us at:
NZ Transport Agency Waka Kotahi
PO Box 973
Waikato Mail Centre
Hamilton 3240
New Zealand
Get the latest state highway travel information check the Journey Planner website(external link)
Report issues impacting travel call 0800 4 HIGHWAYS (0800 44 44 49).
