New Zealand’s road transport produces more than 40% of total CO2 emissions. To meet the Paris Climate Agreement will require a transport system based on zero-carbon energy resources. Many transport ideas focus on expensive new technologies such as electric vehicles or self-driving cars, but transport is also a result of built environment and behavioural choices. This research explores the effect of a shift to public transport, walking and cycling and a reduction in private vehicle use which could be a low-cost way to meet the Paris target of an 80% reduction in emissions without the need for expensive new technologies.