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Recently, hysteretic transitions to ``synchronized traffic'' with high values of both density and traffic flow were observed on German freeways B. S. Kerner and H. Rehborn, Phys. Rev. Lett. 79, 4030 (1997). We propose a macroscopic traffic model based on a gas-kinetic approach that can explain this phase transition. The results suggest a general mechanism for the formation of probably the most common form of congested traffic.
Helbing et al. (Mon,) studied this question.
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