A joint study between the NZ Transport Agency, Wellington City Council and Hutt City Council that outlines an integrated long-term strategy for the Ngauranga Triangle. The Ngauranga Triangle consists of State Highway 1 between Tawa and Ngauranga, State Highway 2 between Ngauranga and Petone, and possible link between Petone and Tawa/Grenada.

The study was completed in stages. An extensive list of transportation measures for the Ngauranga Triangle was developed in the first instance, which was narrowed down to a short list. The short list options were then evaluated, culminating in recommendations that are contained in the Ngauranga Triangle technical report.

The summary of the technical report provides an overview of the processes followed by the study and its recommendations. More detail on each of the stages can be found in the Ngauranga Triangle technical report, the Short options report and the Long list assessment report.