An Application of Topaz to Leeds.

This paper is concerned with work undertaken for the International Study Group on Land Use Transport Interaction (ISGLUTI) which is coordinated by the Transport and Road Research Laboratory. In Phase I of the study computer models which represent the interaction between transport and land use have been used to examine the effects of an agreed set of policies. While this has produced interesting results, the models were applied to different study areas, and this made it difficult to distinguish between the effects of different model formulations and the effects of the study areas themselves. Therefore, in Phase II of the study, models and data sets are being exchanged so that results from a number of models applied to the same study area can be compared. This paper describes one contribution to this part of the study in which the TOPAZ model developed at CSIRO in Australia has been applied with data from Leeds. This makes possible comparisons with results from the LILT model (Mackett, 1979) which has been extensively applied to Leeds.

In Section 2 the TOPAZ model is described briefly. This is followed by a discussion of the data used in the application to Leeds. Section 4 describes the results of running the model with this data. Section 5 presents the results of varying certain inputs of the model in order to examine its sensitivity to such changes. In Section 6 the effects of the application of some of the policy tests devised for ISGLUTI are considered in relation to a base run of the model. The results from TOPAZ are also compared with those from the LILT model. The final section draws some conclusions from this work.