Continuous Network Design For Different Traffic Demands

Traffic congestion from the essence is because of the imbalance between traffic supply and traffic demand. The aim of the traffic network design is to adapt to the variance of traffic demands through perfecting the traffic network design. In recent years, with the improvement of living standards, the host of city major events is more frequent. Compared to the day-to-day traffic demand, the variance of the traffic demand and the network user's route choice behavior during the city major events become one of the most important reasons of traffic congestion.Therefore we should consider the influence of different traffic demands in network design so that it can make the network coordinated with the traffic supply and traffic demand, alleviate urban traffic congestion.In this paper, from standpoint of the traffic supply and traffic demand, the influence of different traffic demands to network capacity was analyzed. At the same time, the influence of the network user's route choice behavior to the traffic network equilibrium state was also analyzed. Dividing traffic demands into day-to-day traffic demand and the traffic demand of the city major events.On this basis, the paper considered the influence of the city major events when increase the traffic supply and fixed the objective function. A bi-level program which had two lower users'equilibrium models was established.Meantime,an algorithm of chaos simulated was designed. The test work results showed that this model can obtain a more rational distribution of the network traffic and improve the adaptability of the traffic network and alleviate the traffic congestion.