One way to estimate the wider impacts of transport policies is to use a computer model which incorporates the both-way interactions between land use and transport. The Leeds Integrated Land-Use Transport (LILT) model, which represents the relationships between transport costs and the spatial distribution of population, housing, jobs, employment and shopping is one such model and is described in this report. Transport supply is represented by the generalised cost of travel by private and public transport, and walking. Housing and jobs are located by the model; the population and workers occupying these and making trips between them are calculated in such a way that only those who are choosing new homes or jobs are relocated over time. A distinction is made between physical infrastructure and activities so that mismatches between demand and supply, such as vacant houses, are included. Land availability is also taken into account. After the solution of the equation system a wide range of output indicators is obtained. The use of the model is illustrated by examining the effects of changes in the monetary costs of travel on travel patterns and the location of jobs, housing and population and seeing to what extent the travel patterns themselves are influenced by the relocation of homes and jobs and the people choosing them. The report concludes with an assessment of the validity of the model. (A)

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