A discrete model of pedestrian motion is presented that is implemented in the Floor field- and Agentbased Simulation Tool (F.A.S.T.) which has already been applicated to a variety of real life scenarios. The F.A.S.T. model is discrete in space and time with an orthogonal lattice. It can be classified as probabilistic CA with extensions demanded by reality. There is a hard-core exlusion between the agents, of which at maximum one can stand at a cell at a certain point in time. An agent needs the space of one cell. This implies a cell size of roughly 40· 40 cm~2, the minimum space a pedestrian occupies [Dre67]. So far the model follows earlier models [Klu03, Kes01]. In fact this model is in many aspects an extension - mainly related to speeds larger one cell per round - of the model presented in [Kir02] which itself had predecessors [Bur01a, Sch01a, Bur01b].
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