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A key input to the development of the WTSM model is land use data which is used in the development of trip matrices. Travel demand within the Wellington Strategic Transport Model (WTSM) is determined by several factors, with the most critical being the demographic makeup of the region. This includes the number, age distribution, labour force status and location of residents, along with employment location. These forecasts are critical as population has a causal relationship with travel demand. This information is required in the form of the number of employees, residents, households and students located in each WTSM zone.