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Karlsruhe, Germany

Kretz T.,PTV Group
Physica A: Statistical Mechanics and its Applications

The Social Force Model is one of the most prominent models of pedestrian dynamics. As such naturally much discussion and criticism have spawned around it, some of which concerns the existence of oscillations in the movement of pedestrians. This contribution is investigating under which circumstances, parameter choices, and model variants oscillations do occur and how this can be prevented. It is shown that oscillations can be excluded if the model parameters fulfill certain relations. The fact that with some parameter choices oscillations occur and with some not is exploited to verify a specific computer implementation of the model. © 2015 Elsevier B.V. All rights reserved. Source

Kara D.,PTV Group | Koesling S.,PTV Group | Kretz T.,PTV Group | Laugel Y.,Head of traffic management Center | And 2 more authors.
Proceedings of the Institution of Civil Engineers: Civil Engineering

Planning of urban spaces and mobility has become a demanding task. All modes of transport have to be granted their very own right of way. Stakeholders of particular modes, tourists and commuters, old and young have their own needs and ideas and they all demand to be involved in the planning process of transport projects without having to dig into the words and numbers produced by traffic engineers. Microsimulation is a tool which accommodates both: the requirements that are set by the complexity of such projects, as well as the needs to produce easy-to-understand information and communication material. This paper demonstrates the capability of microsimulation through a French case study, including the planning and design of transport schemes for a busy city centre and urban area where all modes of transport are being used and there is a strong focus of public attention. © ICE Publishing: All rights reserved. Source

Kretz T.,PTV Group | Lehmann K.,PTV Group | Hofsass I.,PTV Group
Advances in Complex Systems

For the simulation of pedestrians, a method is introduced to find routing alternatives from any origin position to a given destination area in a given geometry composed of walking areas and obstacles. The method includes a parameter which sets a threshold for the approximate minimum size of obstacles to generate routing alternatives. The resulting data structure for navigation is constructed such that it does not introduce artifacts to the movement of simulated pedestrians and locally pedestrians prefer to walk on the shortest path. The generated set of routes can be used with iterating static or dynamic assignment methods. © 2014 World Scientific Publishing Company. Source

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