Reviving the Forgotten Highway SH43

The SH43, often known as the Forgotten World Highway due to its remote and untouched nature, is a vital route that connects remote communities in Taranaki, Aotearoa New Zealand. Despite its scenic beauty, its unsealed sections posed significant safety risks and hindered regional economic development. NZTA sought to improve the safety and resilience of SH43, enhance tourism accessibility, and minimise environmental impacts on the Tāngarākau Scenic Reserve. The project faced challenges such as environmental sensitivity, funding delays, and disruptions caused by the COVID-19 pandemic.

GHD was entrusted with transforming SH43 into a safer and more resilient route. Our approach was multifaceted, addressing both the technical and environmental aspects of the project. We implemented best-practice stormwater management and eco-sensitive construction methodologies to minimise ecological disruption. To manage funding uncertainties between Stage 1 and Stage 2 of the project, we adopted adaptive project planning. Our team adjusted schedules and workflows to align with evolving health restrictions during the COVID-19 pandemic. We maintained active communication with NZTA, Department of Conservation (DOC), Iwi, and local communities to ensure alignment and support.

The project’s outcomes were improved by using advanced digital surveying and innovative construction methods. Light Detection and Ranging (LiDAR) technology was used for precise terrain assessment, providing high-resolution topographic data necessary for designing the road widening and sealing. This precision helped to identify potential problem areas and allowed us to plan the construction with minimal environmental impact. The project incorporated eco-sensitive construction techniques, including using retaining walls and barriers designed to integrate with the natural landscape while enhancing road safety. Sustainable stormwater management solutions were implemented to protect the waterways in the Tāngarākau Scenic Reserve. Innovative road widening strategies preserved the natural landscape, with minimal widening in sensitive areas and using materials that blended with the environment.

The SH43 Seal Extension project has significantly improved safety and accessibility for road users, reducing travel times and enhancing the overall experience for road users. The project has also boosted regional tourism, providing easier access to the scenic Tāngarākau Gorge and supporting local economic activity. Environmentally, the project has preserved native biodiversity and minimised ecological disruption through sustainable road design. The positive feedback from Waka Kotahi NZTA highlights our commitment to safety, environmental considerations, and strong stakeholder relationships. This project stands as a testament to our ability to deliver complex infrastructure projects that benefit both the community and the environment.