a modal split model is put forward that contains a description of the transport system available for long distance trips between a set of regions. each journey is treated as being of three parts: 1. access: the departure from a specific origin area in one region to an access point to a main haul mode between the regions: 2. main haul: the trip between the two regions on a specific mode:3. egress: the last leg of the journey, from the terminal in the city region of the destination to the destination itself. a simplified network model has been constructed on this basis, and contains a geographical representation of the transport alternatives. every link in this network is a different alternative method of travel between the points it links, and the travel time, waiting time, and travel cost along that link summarises the main characteristics of the set of travel choices that it represents. the travellers of a given income bracket are assumed to have a specified valuation of travel time, and the generalised (time and money) cost of a trip along every given link will differ for each income bracket. the travel demand for each class of traveller is distributed over the different alternatives on the basis of the generalised cost, and all the classes of travellers summed to give the modal splits between the main haul modes. this model is suitable for assessing the effect of introducing new modes of transport between the regions, and can also be used to assess the effect of different terminal sitings.(a)

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