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Synchronized Flow And Phase Separation In A Two-Lane Cellular Automaton Model

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  • YAO-MING YUAN

    (School of Engineering Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China)

  • RUI JIANG

    (School of Engineering Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China)

  • QING-SONG WU

    (School of Engineering Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China)

  • RUILI WANG

    (Institute of Information Sciences and Technology, Massey University, New Zealand)

Abstract

This paper extends a cellular automaton model, named modified comfortable driving (MCD) model, to a two-lane roadway. A symmetric lane-changing rule set has been proposed (Set I). The fundamental diagram, the lane-changing frequency and space-time plots are presented. It is found that for the two-lane model, there exists a density range in which phase separation between synchronized flow and wide-moving jams on one lane, and between light synchronized flow and heavy synchronized flow on the other lane, can be maintained for quite long periods of time. In this density range, (i) the outflow from jams is synchronized flow; (ii) wide moving jams are sparse. These are consistent with the empirical observation. We also investigate a slightly different lane-changing rule Set II in which stopped vehicles are not allowed to change lane. It is shown that in this case, the phase separation, between free flow and wide moving jams on one lane and between free flow and heavy synchronized flow on the other lane, can be maintained for sufficiently long periods of time. Consequently, the flux is enhanced comparing to that of rule Set I.

Suggested Citation

  • Yao-Ming Yuan & Rui Jiang & Qing-Song Wu & Ruili Wang, 2007. "Synchronized Flow And Phase Separation In A Two-Lane Cellular Automaton Model," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 18(02), pages 267-279.
    • Handle: RePEc:wsi:ijmpcx:v:18:y:2007:i:02:n:s0129183107010401
    DOI: 10.1142/S0129183107010401
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