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The so called “free crossing area” (FCA) is one possible traffic regime to design a street according to the shared space-idea in Switzerland. By removing all zebra crossings, pedestrians are able to cross the street freely at any point, strengthening the interaction between traffic modes. FCAs have shown to work very well, particularly on traffic-oriented streets with high vehicle volumes. This street layout has only been used reluctantly until now, one reason being the difficulty to identify the effects of FCA in advance. For this purpose, traffic simulation offers a great opportunity, helping planners assessing different traffic layouts in an early stage. In this work, a microscopic simulation of FCA has been set up in Vissim, implementing non-standardized solutions through the COM API. The simulation focusses on the interaction behavior between pedestrians and vehicles, which is modelled using conditional probabilities. The model was calibrated and validated using data from the FCA in Köniz, which is based on the Bernese Model – a similar philosophy to shared space. Results show, that, regardless of its simplifications, the simulation model is able to represent vehicle travel times and vehicle continuity very well on a high generalization level. It is accurate enough to allow a comparison of traditional pedestrian crossing designs and FCA with respect to delay and capacity. This analysis shows, that since mean delay for every user in FCA is in most cases lower than in comparison to traditional street layouts as zebra crossings, the regime should always be considered when designing a street, especially in situations of high pedestrian activity.