Based on NS model, a mixed traffic flow on single lane is simulated in the paper, which includes two-classification vehicles owing the different max-velocity. Take the one move 5 grids for one time as quick-vehicle, which is the results of aggressive behavior, such as overtaking and closely following behavior. And take the one which moves 3 grids for one time as slow-vehicle, which is on behalf of normally driving. The relationship among discrete of traffic flow, traffic density and chaos is researched, in the hope of preparing the solid theoretic basis for eliminating the bad chaos in traffic...
