Formally it would be known as the Ministry of Planning and the Environment and it would have four major departments. The Geography Department as the overall watchdog, enforcer and coordinator when two or more of the departments are involved The Department of the Environment to handle the Resource Management Act (which is meant to manage the effects on the Natural Environment) The Department of the Urban/Built Environment and Building to handle a new Urban/Building and Building Environment Act (managing the urban environment and also absorbing the Building Act) New Zealand Infrastructure Agency (chief agency overseeing and investor of roads, rail tracks and sea ports) Transport functions like licensing, Road User Charges and registrations remain with NZTA and the Ministry of Transport. Existing functions on handling the effects of the natural environment outside of an urban centre/limits would remain with the Resource Management Act and the new Department of the Environment. All urban matters including water and air inside an urban area would shift to the new Department of Urban/Built Environment and Building division including the Auckland Unitary Plan and the Auckland (Spatial) Plan. The NZIA handles the investment and maintenance of the State Highways and the heavy rail network while also sharing costs on intra-regional schemes like bus-ways and light rail. NZTA would continue providing OPEX subsidies to things like the busses and passenger trains. The Geography Department is the overall watchdog, enforcer and coordinator of the entire Ministry: Watchdog: To oversee the other Departments making sure they are delivering per policy requirements Enforcer: Pretty much the butt kicker if the Departments are slacking off from policy requirements. They can also bring about prosecutions if other entities or persons break the laws set about for or by the respective Departments Coordinator: when a major inter-regional planning and development exercise is undertaken spanning multiple entities across multiple jurisdictions and agencies the Geography Department is the one that sits on top of everything making sure the planning and delivery of the projects occur. Its watchdog and enforcer functions can apply if things go sideways The New Zealand Infrastructure Agency oversees the roads, tracks and governance of the ports. It has full access to the National Land Transport Fund which can be used to build said roads and tracks (note: track access fees would contribute to the NLTF just as road user charges and fuel taxes do from roads). - voakl.net