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A cellular automaton model of traffic current on a two-lane highway is proposed. Clustering and hopping mechanisms are introduced into the interactions between individual cars by the traffic rules. The power spectrum of the traffic current may show good 1/f behavior in certain parameter regions. The 1/f noise is the result of many-body interactions of clustering and hopping. It is found that a state with 1/f noise has a remarkable advantage allowing effective transporting.
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Zhang et al. (1995) studied this question.
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