The traffic flow is interrelated to traffic congestion, the big traffic flow directly results in traffic congestion of some section. In this paper on the basis of the research of overseas traffic accident, considering the characteristic of Chinese traffic, artificial neural network is used to predict traffic accident, a improved BP artificial neural network model according with Chinese the situation of a country is proposed. The urban traffic flow prediction is simulated under the particular situation, the result of the simulation shows that the improved BP artificial neural network shown in this paper can fit the urban traffic flow prediction very well and have high performance.
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