This video shows the animation of a PTV Viswalk pedestrian simulation – rendered three times by walking chirality (00:11), experienced density (02:15), and walking speed (04:19) - where crowds walk in a roundabout, thus a "crowdabout".


Pedestrians are set into the simulation at 16 different input areas equally distributed on the outer half of a ring with an inner diameter of 400 m and an outer diameter of 536 m. During one hour of simulation a total of 200,000 pedestrians are created and assigned one of the two walking directions with equal shares. The input volume is stronger in the beginning such that more than 50% of pedestrians are created after 20 minutes of simulation and only less than 5% in the last 10 minutes. This results in a density of 2 pedestrians per square meter at the end of the simulation which is well above the capacity of bi-directional movement. One must therefore expect that the flow is collapsing at some time and the system deadlocks.


The different perspectives, renderings, and fast-forward factors show how macroscopic phenomenon like lanes, short-lived density waves or extended jams arise from microscopic interactions of pedestrians.


The simulation was done under the implicit assumption that the motivation of pedestrians is unbroken until the end of the simulation which is reflected foremostly in a desired speed being constant throughout the full hour. This would be hardly possible in a lab experiment given the conditions towards the end. Therefore, the strong dynamics at the end are more a kind of thought experiment than a realistic prediction.


To find out what happens if pedestrians do not choose their side for evading oncoming pedestrians with equal probability, but when they prefer to evade to the right, see here: [ Ссылка ] "PTV Viswalk: 200k Right-Hand Traffic Pedestrians in a 'Crowdabout' (Part II)"


Read more at [ Ссылка ]


Find out more about PTV Viswalk: [ Ссылка ]

свернуть