Real - Time simulations in traffic planning are limited to a microscopic plane such as intersections or short sections of a route. On a mesoscopic Level (City Level) planning data are evaluated by scenarios and represented by traffic models, but are not simulated in real time. Due to the complexity of the acquired data, the communication of planning projects between the planners and the population is increasingly difficult. At this point, this thesis begins with the idea of using urban building simulations for urban planning. This work deals with computer games, which offer a learning function in addition to playful elements and presents relevant games in an exemplary overview. It is investigated whether the use of urban planning simulation games for traffic and urban planning is possible, because it is easy to simulate whole cities in real time, whether complex contents can be communicated between a planning team and the population and whether the increasing involvement of lay persons in decision making can be facilitated. Subsequently, a digital model of the city of St. Po¿lten is generated with the help of the game Cities: Skylines and adjusted with modifications. For a better use, the appearance and the buildings of the city were transformed into an abstract representation in order to focus the model on an accurate road generation and traffic simulation. This model is used to study the simulated urban traffic, to extend a planned detour of the city and to check its impact on noise and traffic volumes.