Critical Density of Experimental Traffic Jam

  • Shin-ichi Tadaki
  • Macoto Kikuchi
  • Minoru Fukui
  • Akihiro Nakayama
  • Katsuhiro Nishinari
  • Akihiro Shibata
  • Yuki Sugiyama
  • Taturu Yosida
  • Satoshi Yukawa
Conference paper


In a previous experiment, we have demonstrated that a traffic jam emerges without any bottleneck at a certain high density. In the present work, we performed an indoor circuit experiment in Nagoya Dome and estimated the critical density. The circuit is large (314 m in circumference) compared to the previous experiment. Positions of cars were observed in 0.16 m resolution. We performed 19 sessions by changing the number of cars from 10 to 40. We found that jammed flow was realized in high density while free flow in low density. We also found the indication of metastability at an intermediate density. The critical density is estimated by analyzing the density-flow relation. The critical density locates between 0. 08 and 0. 09 m−1. It is consistent with that observed in real expressways.



We thank Nagoya Dome Ltd, where the experiment was performed. We also thank SICK KK for their technical support with the laser scanner. And finally we thank H Oikawa and the students of Nakanihon Automotive College for assisting with this experiment. This work was partly supported by The Mitsubishi Foundation and a Grant-in-Aid for Scientific Research (B) (no. 20360045) of the Japanese Ministry of Education, Science, Sports and Culture.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Shin-ichi Tadaki
    • 1
  • Macoto Kikuchi
    • 2
  • Minoru Fukui
    • 3
  • Akihiro Nakayama
    • 4
  • Katsuhiro Nishinari
    • 5
  • Akihiro Shibata
    • 6
  • Yuki Sugiyama
    • 7
  • Taturu Yosida
    • 3
  • Satoshi Yukawa
    • 8
  1. 1.Department of Information ScienceSaga UniversitySagaJapan
  2. 2.Cybermedia CenterOsaka UniversityToyonakaJapan
  3. 3.Nakanihon Automotive CollegeSakahogiJapan
  4. 4.Faculty of Science and TechnologyMeijo UniversityNagoyaJapan
  5. 5.Research Center for Advanced Science & TechnologyThe University of TokyoMeguroJapan
  6. 6.Computing Research CenterHigh Energy Accelerator Research Organization (KEK) & Graduate University for Advanced Studies (Sokendai)TsukubaJapan
  7. 7.Department of Complex Systems ScienceNagoya UniversityNagoyaJapan
  8. 8.Department of Earth and Space ScienceOsaka UniversityToyonakaJapan

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