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We study the duration of "high-flow states" in freeway traffic, defined asthe time periods for which traffic flows exceed a given flow threshold. Ourempirical data are surprisingly well represented by a power law. Moreover, thepower law exponent is approximately 2, in dependently of the chosen flowthreshold. In order to explain this discovery, we investigate a simpletheoretical model of heterogeneous traffic with overtaking maneuvers, which isable to reproduce both, the empirical power law and its exponent.

A Power Law for the Duration of High-Flow States in Heterogeneous Traffic Flows