This report gives details of TRL's Strategic Transport Model (STM) which represents travel within and into urban areas. The model has been calibrated for London from the 1981 Greater London Travel Survey (GLTS). The model considers travel by car, bus, BR, Underground, walk and taxi, for the following purposes: work, shop, education, other, by the elderly, and travel for three levels of car ownership. Modal choice is determined according to generalised cost. There is an option so that the distribution of journey destinations may be either fixed or variable. While there is no explicit transport network, each zone has its own speed/flow relationship. The model iterates until modal split, generalised cost and speed/flow are in equilibrium. Public transport fares and services may be adjusted until costs equate to passenger revenues, or fares and services may be specified beforehand. The model operates at a spatially aggregate level (Greater London is represented by 13 zones) and is designed as a tool for strategic policy analysis. Travel behaviour can be predicted at five yearly intervals between 1981 and 2011. The model can be used to test a range of options covering pricing, investment and regulation of transport systems. (A)

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