Research on improved model of expressway flow control

The macroscopically dynamic traffic flow model describes the distribution of traffic flow along the road space.Thus it is mostly adopted in the present domestic flow control of the expressway.In fact,the state of vehicles has more frequent changes between the front 500 m of ring road in the outlet and the rear 500 m of ring road in the entry,and in other pavement the state of vehicles generally becomes smooth.The macroscopical model usually deviate the reality in certain section.An improved traffic flow control model of expressway is developed on the basis of traditional macroscopical model in this paper.The model parameters were identified with the field data of the expressway.The results indicate that the improved model could describe the expressway's actual status more accurately than the traditional model.