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Title: Factors influencing the physical complexity of routes in public transportation networks

Routing decisions by humans are often made based on other criteria than minimum distance, time or cost. We are interested in determining criteria that influence individual travel behavior. The criterion we study in detail in this paper is the perceived complexity of routes, i.e. the perception of how difficult a chosen route will be. For this paper we focus on the physical complexity of routes as opposed to personal or temporal complexity. The physical complexity relates to the visual access and the spatial layout of the built environment. We report on empirical studies that determine the factors influencing route complexity within the public transportation system of Zurich. We then derive a measure for the physical complexity of routes from these factors.