Diffusion model of density of traffic platoon and signal coordinated control

The evolving property of queuing length of traffic platoon is microcosmicly studied by using simulated dynamic model of traffic flow theory.On the basis,the evolving law of density during the diffusion of traffic platoon at signal-intersection is researched,and the density diffusion model is got.At last,the model is used to infer the expression of the number vehicles on the tail of the traffic platoon jammed before the backward signal intersection,which is useful in the signal coordinated control of neighbor intersections.