Building on my publication 'Blood and Dirt: Prison Labour and the Making of New Zealand' (Bridget Williams Books: 2023), this research charts the construction by prisoners of State Highways 4, 46, 47 and 48 through the central plateau (and Tongariro National Park in particular). Beneficent language of development and modernisation smooths over the colonial dispossession, forced labour and class antagonism at the heart of these highways. The study of prison-built infrastructure also reveals the dialectical nature of appropriation and exploitation, extra-human and human, within the web of life.