Abstract：In order to solve the increasingly serious congestion of expressways, the traffic operation state and its evolution law are discussed, and the traffic state discrimination standard is determined. The traffic simulation platform VISSIM software is used for simulation analysis, and the spectral clustering analysis algorithm is used to accurately extract the abrupt boundary of traffic state. Combined with the cusp catastrophe theory, the traffic flow state at different times and locations is studied and analyzed. The results show that there is an obvious catastrophe phenomenon when the traffic flow transforms between the two states of free flow and congestion flow.
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