The purpose of this paper is to suggest ways in which vulnerable road users can be included in the traffic modelling process and to give a summary of actual models that are presently being constructed for pedestrians and cyclists under DRIVE Project V 1031. The paper starts by outlining a conceptual framework for "network analysis" models which emphasises that there are a number of modes available to people wishing to make a journey and that this fact should be reflected in the traffic models used for prediction purposes by transport planners. In this framework particular emphasis is placed upon safety models. Models are then described which represent the movement and safety of pedestrians and cyclists in small urban networks, typically of the size of three road junctions. It is intended that these models should be able to interact with SATURN, the popular motorised vehicle model, at some point in the future: this intention has a strong influence on their construction, particularly with regard to the cyclist model. Finally the paper describes a case study using SATURN to investigate the likely effects on car traffic of a number of pedestrian-friendly policies in a part of Leeds in England. This work, which is concerned with model implementation as opposed to model creation, looks ahead to the day when it will be possible to use a total system model to estimate the effects of any traffic management measure on all modes of traffic. 3
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