https://collective-dynamics.eu/index.php/cod/issue/feed Collective Dynamics 2022-05-17T15:47:40+02:00 Editorial Team info@collective-dynamics.eu Open Journal Systems <p><span style="font-weight: 400;">Collective Dynamics is a diamond open-access multidisciplinary journal for pedestrian dynamics, vehicular traffic and other systems of self-driven particles or interacting agents (further information <a href="https://collective-dynamics.eu/index.php/cod/about">here</a>). <br /></span></p> https://collective-dynamics.eu/index.php/cod/article/view/A139 Microscopic insights into pedestrian motion through a bottleneck, resolving spatial and temporal variations 2020-04-08T15:28:06+02:00 Jack Liddle a.seyfried@fz-juelich.de Armin Seyfried a.seyfried@fz-juelich.de Bernhard Steffen m.boltes@fz-juelich.de Wolfram Klingsch a.seyfried@fz-juelich.de Tobias Rupprecht a.seyfried@fz-juelich.de Andreas Winkens a.seyfried@fz-juelich.de Maik Boltes m.boltes@fz-juelich.de The motion of pedestrians is subject to a wide range of influences and exhibits a rich phenomenology. To enable precise measurement of the density and velocity we use an alternative definition using Voronoi diagrams which exhibits smaller fluctuations than the standard definitions. This method permits examination on scales smaller than the pedestrians. We use this method to investigate the spatial and temporal variation of the observables at bottlenecks. Experiments were performed with 180 test subjects and a wide range of bottleneck parameters. The anomalous flow through short bottlenecks and non-stationary states present with narrow bottlenecks are analysed. 2022-08-10T00:00:00+02:00 Copyright (c) 2022 Jack Liddle, Armin Seyfried, Bernhard Steffen, Wolfram Klingsch, Tobias Rupprecht, Andreas Winkens, Maik Boltes https://collective-dynamics.eu/index.php/cod/article/view/A138 Pushing and Non-pushing Forward Motion in Crowds: A Systematic Psychological Observation Method for Rating Individual Behavior in Pedestrian Dynamics 2022-05-17T15:47:40+02:00 Ezel Üsten e.uesten@fz-juelich.de Helena Lügering h.luegering@fz-juelich.de Anna Sieben an.sieben@fz-juelich.de <p>Pushing behavior impairs people’s sense of well-being in a crowd and represents a significant safety risk. There are nevertheless still a lot of unanswered questions about who behaves how in a crowded situation, and when, where, and why pushing behavior occurs. Beginning from the supposition that a crowd is not thoroughly homogenous and that behavior can change over time, we developed a method to observe and rate forward motion. Based on the guidelines of quantitative content analysis, we came up with four categories: (1) falling behind, (2) just walking, (3) mild pushing, and (4) strong pushing. These categories allow for the classification of the behavior of any person at any time in a video, and thereby the method allows for a comprehensive systematization of individuals’ actions alongside temporal crowd dynamics. The application of this method involves videos of moving crowds including trajectories. The initial results show a very good inter-coder reliability between two trained raters demonstrating the general suitability of the system to describe forward motion in crowds systematically and quantify it for further analysis. In this way, pushing behavior can be better understood and, prospectively, risks better identified. This article offers a comprehensive presentation of this method of observation.</p> 2022-08-05T00:00:00+02:00 Copyright (c) 2022 Ezel Üsten, Helena Lügering, Anna Sieben https://collective-dynamics.eu/index.php/cod/article/view/A137 Effects of Driving Style on Energy Consumption and CO2 Emissions 2022-04-15T09:32:41+02:00 Susana Carreón-Sierra scarreons@gmail.com Alejandro Salcido vasalcido@gmail.com <div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> <p><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">The tractive force developed by energy consumption (EC) in a car engine produces its acceleration and sustains the motion against velocity dependent resistance forces. In internal combustion engines, fuel burning entails pollutant emissions (PE) released into the atmosphere. In vehicular traffic, EC and PE depend on the driving style. This paper assumed that the transition rules in a traffic cellular automata (TCA) represent a driving style, and its effect on EC and PE in TCA is studied. Extending empirical relationships, we proposed models to estimate EC and PE in TCA from the velocity and acceleration distributions, which we obtained by computer simulations for three well-known TCA. The Nagel-Schreckenberg (NS) and Fukui-Ishibashi (FI) models, and a variant (NS+FI) defined by combining the NS and FI rules, were considered. The FI driving style revealed EC and CO</span><span style="font-size: 9.000000pt; font-family: 'NimbusRomNo9L'; vertical-align: -2.000000pt;">2 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">emission rates dependent on the stochastic delay (</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">p</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">) only for low vehicular densities. We also detected that the larger EC and CO</span><span style="font-size: 9.000000pt; font-family: 'NimbusRomNo9L'; vertical-align: -2.000000pt;">2 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">emission rates were 45</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">4 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">kW </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">and 26</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">7 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">g</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">s </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">with no dependence on </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">p</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">. With NS and NS+FI driving styles, the larger energy consumption and CO</span><span style="font-size: 9.000000pt; font-family: 'NimbusRomNo9L'; vertical-align: -2.000000pt;">2 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">emission rates occurred for small stochastic delays, 18</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">4 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">kW </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">and 6</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">6 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">g</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">s </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">and 61</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">1</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">kW </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">and 30</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">2 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">g</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">s </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">for </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">p </span><span style="font-size: 12.000000pt; font-family: 'CMR10';">= </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">0.2. On average, for NS, FI, and NS+FI models (</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">p </span><span style="font-size: 12.000000pt; font-family: 'CMR10';">= </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">2), we obtained energy consumptions of 1</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">88, 2</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">60, and 2</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">76 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">MJ</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">km</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">, fuel consumptions of 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">08, 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">12, and 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">13 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">L</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">km</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">, and CO</span><span style="font-size: 9.000000pt; font-family: 'NimbusRomNo9L'; vertical-align: -2.000000pt;">2 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">emissions of 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">158, 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">460, and 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">562 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">kgCO</span><span style="font-size: 9.000000pt; font-family: 'NimbusRomNo9L'; vertical-align: -2.000000pt;">2</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">km</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">. Our results agree with those (3</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">37 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">MJ</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">km </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">and 0</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">.</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">235 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">kgCO</span><span style="font-size: 9.000000pt; font-family: 'NimbusRomNo9L'; vertical-align: -2.000000pt;">2</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">km</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">) of petrol combustion car engines at 10 </span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">km</span><span style="font-size: 12.000000pt; font-family: 'CMMI10';">/</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L'; font-style: italic;">L</span><span style="font-size: 12.000000pt; font-family: 'NimbusRomNo9L';">. This work may help in designing flow and driving style scenarios to optimize vehicular traffic EC and reduce PE. </span></p> </div> </div> </div> 2022-05-11T00:00:00+02:00 Copyright (c) 2022 Susana Carreón-Sierra, Alejandro Salcido