Computer models of the transport system are likely to be required to provide the information necessary for an appraisal that complies with the Government’s New Approach to Appraisal. These models may take a variety of forms, depending on the nature of the study area, the problems to be addressed and the potential solutions to be considered. The availability of existing models and data may also influence the form of the model adopted in any particular study.
In most Multi-Modal Studies, the appropriate model structure will include separate representations of the highway and public transport system along with some means of forecasting the changes in demand over time and between modes. In some studies, it may also be appropriate to extend the traditional transport-modelling framework to include the impacts of transport on land uses.