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The Wellington Transport Strategy Model (WTSM) and the Wellington Public Transport Model (WPTM) are the modelling tools that have been updated / developed for Greater Wellington Regional Council (GWRC). The WTSM is a 4-step regional travel demand model whilst the WPTM is a public transport model that is linked to WTSM and shares a common network, but different zone systems:

• WTSM comprises 228 zones, made up of 225 internal zones and 3 external zones (+50 park and ride (P&R) station zones).
• WPTM comprises 780 zones (+50 P&R station zones)