Rejuvenation of existing structures in New Zealand’s land transport infrastructure

Civil engineers play a vital role in contributing to meeting the United Nations Sustainable Development Goals by reducing greenhouse gas emissions, not only during construction of new infrastructure but also by extending the lifespan of existing assets. This paper focuses on how engineers in New Zealand have adopted clever yet elegant solutions to reuse, repurpose and revitalise existing land transport structures in the past two decades. Case studies of road and rail bridges from Waka Kotahi New Zealand Transport Agency and KiwiRail network highlight the various challenges, solutions and lessons learned.