About Tobias Kretz

Tobias Kretz, a PhD in Physics, has a strong scientific and technical experience. In over 50 scientific publications he has been and is contributing to defining and extending the state of the art of the simulation of pedestrians. He has joined PTV Group in 2007 taking care as a technical product manager for the pedestrian simulation from the beginning on. Also part of his leisure time is occupied with bi-pedal motion: as a runner he is passionate (but not at all contributing to the global state-of the art), as a hiker he’s become an expert for Black Forest and other landscapes around Karlsruhe.

Modelling cableway operations with PTV Vissim and PTV Viswalk

We usually associate cableways with transporting people in areas with rough terrain, for overcoming large height differences or as a tourist attraction. However, for a few years now they have increasingly been used as a means of urban transport. And exactly like classic means of transport such as buses, cars and trams, they and their passengers can be modelled with the microsimulation software PTV Vissim and the microscopic pedestrian simulation tool PTV Viswalk.Read more

5 modes of transport with 200 people each – focussing on space usage

Do you remember our blog post “5 modes of transport with 200 people each – FLOW of people” and the accompanying simulation video we published in April 2016? In that video we showed, how much time 200 people need to pass a stop line – using different modes.Read more

5 modes of transport with 200 people each – why 200?

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200 people passing a traffic light by tram, car, bus, bike and foot

200 people each pass a traffic light in different modes. Which mode will be the first to leave the signal behind? That is a question we tried to answer with a simulation video and a blog post in April 2016 as part of the motivation for the research project FLOW.Read more

RiMEA e.V. & PTV Group – Together for Evacuation Safety

Safe evacuation with RiMEA and PTV Group

Fire in the sports arena! The soccer fans have to be evacuated as fast as possible. To make sure that this really works in the event of an emergency, the non-profit association RiMEA e.V. promotes the use of microscopic simulations in fire protection engineering.  Read more

5 modes of transport with 200 people each – FLOW of people

200: A comparison of traffic modes by means of space, time, speed, and flow

200: A comparison of traffic modes by means of space, time, speed, and flow

Since spring 2015, PTV Group has been involved in the research project FLOW – “Furthering less congestion by creating opportunities for more walking and cycling”. The project aims at researching and demonstrating how measures for walking and cycling can help to reduce urban congestion, including congestion of motorized traffic.Read more

Working with colours in PTV Viswalk


Working with colors for the visualization of PTV Viswalk results

Since the release of version 8 of PTV Viswalk, it has been possible to assess the density in the immediate vicinity of individual pedestrians, and to display this data on the pedestrians themselves using colour coding.Read more

PTV Viswalk tip: Use of density-based partial routes

Imagine that in a bustling building, a train station for example, two pedestrians have two different paths available to them between two key points. One of the two paths can be seen for the most part, while the other has a larger section that is not initially visible (named as ‘concealed’ path).… Read more