Common categories of planning software
Planning workflows can use GIS, travel demand modelling tools, network assignment software, microsimulation, spreadsheets, databases and Python. A project may combine several categories rather than relying on one application.
GIS for transportation planning
GIS supports mapping, spatial analysis, accessibility studies, demographic and land-use overlays, network data preparation and communication of planning results. ArcGIS and QGIS are examples of commonly used GIS platforms.
Network and demand modelling
Transportation planning models can represent travel demand, modes, routes and network performance at different scales. Model selection should follow the planning decision, data quality and required spatial and temporal resolution.
Transportation planning and technology
Modern planning increasingly combines GIS, modelling, Python, cloud workflows, sensors and other data sources. Strong planning practice still requires clear assumptions, validation, interpretation and communication of uncertainty.