Transport Model Updates

The Wellington Transport Analytics Unit own and operate the following models on behalf of regional partners:

Wellington Transport Strategy Model (WTSM) -2001, 2006, 2011, 2013 and 2018

Wellington Public Transport Model (WPTM) – 2011, 2013, 2018

Wellington AIMSUN Model – 2016

Hutt City AIMSUN Model – 2017

We provide documentation relating to all model updates so that interested parties can understand how the models have evolved through time.


The Wellington Regional Transport Analytical Tools were updated over the period 2020 to 2023 with the purpose being improve and add functionality, refresh behaviour assumptions and identify known weaknesses to develop a set of tools that can be used for the strategic assessment of transport investment and policy. The regional modelling suite at completion of this project consists of:

  • Wellington Transport Strategy Model (WTSM) – a 4 stage demand model that is the central tool for demand forecasting
  • Wellington Public Transport Model (WPTM) – a more detailed public transport model for the development and assessment of public transport schemes
  • Wellington Traffic Assignment Model (WTAM) – a more granular traffic model for the assessment of traffic interventions and impacts”


Hutt City AIMSUN model was developed.


Wellington City AIMSUN model was developed to provide a meso-scopic and micro-simulation modelling tool for Wellington City to help with the assessment and evaluation of Let’s Get Wellington Moving.


WTSM was updated to a new 2006 baseline using Census data, with revised forecast models developed.