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The 4th International Workshop on Crowds and Cellular Automata (C&CA) and the 2nd International Workshop on Traffic and Cellular Automata (TCA), were organized in the framework of the 10th edition of ACRI 2012 Conference (Cellular Automata for Research and Industry). On one hand, C&CA Workshop provided researchers from different disciplines with the opportunity to present their work, introduce their methods and communicate their ideas on CA-originated modeling and simulation of crowds and pedestrians dynamics, within an advanced scientific environment; on the other hand, TCA Workshop offered them the chance to study traffic-related topics, discuss methods for modeling as well as about analysis and practical traffic applications.

Following the previous C&CA and TCA editions, which were held in conjunction with ACRI Conferences in Perpignan, France (2006), in Yokohama, Japan (2008) and in Ascoli Piceno (2010), respectively, the scope and objectives of both workshops find their own specificity within the topics of crowd and traffic modeling when the computational tool of CA is applied. Thus, they act complementing to other famous related events concerning pedestrian and traffic issues, like Pedestrian and Evacuation Dynamics (PED) Conference and Traffic and Granular Flow (TGF) Conference, respectively. The specialization of the C&CA Workshop arrives from CA-comparable, computer simulation-based methods of crowd research, application demonstrations and domain analyses as well as overviews and states-of-the-arts about social and psychological aspects, following CA-inspired approaches of crowd dynamics. In accordance, the TCA Workshop is related to traffic modeling, which includes vehicular traffic on highway networks, city traffic with signal control and public conveyance. It also studies the investigation of such systems for both practical and scientific reasons and the corresponding reduction of traffic congestion through modeling of traffic flow, thus allowing for new insights into nonequilibrium systems of self-driven particles.

Topics of both the workshops include, but are not limited to: 

  •  crowd dynamics
  • pedestrian behaviour
  • spatial competition
  • urban design and planning
  • social self-organisation
  • collective beliefs and behaviour
  • competition, collaboration
  • social structures
  • traffic modeling (highway and urban traffic, public transport, etc.)
  • analytical methods
  • computer simulations
  • empirical results, experiments and data analysis
  • engineering applications
  • traffic networks
  • related systems (biological transport, granular flow, etc.)

A major part of these topics is covered by the content of this special issue. In specific, twelve papers, six of them related to crowds and CA and the other six to traffic issues modeled by CA, constitute a volume of about one hundred and fifty pages. They were all thoroughly reviewed and revised as an extension of their conference papers published in the ACRI 2012 proceedings…

Finally, we would like to thank and acknowledge the twenty-five members of both Workshop Program Committees who kindly accepted to assist us and provided us with their valuable comments during the review process of the aforementioned Conference and Special Issue papers:

Andrew Adamatzky (University of the West of England – Bristol, UK)
Cecile Appert-Rolland (Paris-Sud University 11, Orsay, France)
Stefania Bandini (University of Milano-Bicocca – Italy)
Michael Batty (University College London – UK)
Dietmar Bauer (AIT Austrian Institute of Technology, Austria)
Martin Evans (Edinburgh, UK)
Mizar Luca Federici (CROWDYXITY srl – Italy)
Henryk Fuk´s (Brock University, CA)
Makoto Kikuchi (Osaka University, Japan)
Franziska Kulgl (Orebro University – Sweden)
Hubert Klupfel (TraffGo GmbH – Duisburg, Germany)
Gerta Koster (Munich University of Applied Sciences – Germany)
Tobias Kretz (PTV AG – Germany)
Sven Maerivoet (Transport and Mobility Leuven, Belgium)
Shin Morishita (Yokohama National University, Japan)
Bud Mishra (Courant Institute – New York University – USA)
Michael Schreckenberg (Duisburg University, Germany)
Armin Seyfried (Julich Supercomputing Centre – Julich, Germany)
G. Keith Still (Crowd Dynamics Ltd. UK)
Harry Timmermans (Crowd Dynamics Ltd. UK)
Shin-ichi Tadaki (Saga University, Japan)
Tetsuji Tokihiro (The University of Tokyo, Japan)
Giuseppe Vizzari (University of Milano-Bicocca – Italy)
Rui Jiang (University of Science and technology of China, China)
Peter Wagner (DLR Berlin, Germany)

June 30, 2013
Ioakeim Georgoudas (Democritus University of Thrace – Greece)
Sara Manzoni (University of Milano-Bicocca – Italy)
Katsuhiro Nishinari (Tokyo University – Japan)
Andreas Schadschneider (Institute of Theoretical Physics – Cologne, Germany)
Georgios Sirakoulis (Democritus University of Thrace, Greece)

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