Infrastructure New Zealand underscores the significant economic and social benefits of the Transmission Gully and Kāpiti Expressway projects in the Wellington region. These expressways have collectively saved 3.8 million hours of travel time in 2024, reduced deaths and serious injuries on the roads, and generated a combined economic benefit of $173 million in the last calendar year. Specifically, Transmission Gully alone contributed $79 million in benefits through enhanced safety and travel efficiency, with no fatalities recorded since its opening. The improved connectivity has particularly boosted Porirua, bringing 74,000 more people within a 60-minute drive of its CBD and narrowing the housing price gap with Wellington City by over $63,000.

Local leaders, including Kāpiti Mayor Janet Holborow and Porirua Mayor Anita Baker, emphasize the transformative impact of these roads, noting faster travel, increased economic activity, and safer journeys. The report advocates for continued investment in large-scale infrastructure, citing projects like a second Mt Victoria tunnel and an additional Auckland harbour crossing as critical for future economic and social gains. Despite past challenges, the success of these expressways demonstrates the long-term value of bold infrastructure investments for fostering connected, prosperous communities in New Zealand.