The Studies Of Cellular Automata Models For Urban Main-Road Mixed Traffic Flow

For both developing and developed countries, effective transportation systems are of primary importance in the development of society and economy. The development of transportation is tie up with the development of the whole city. With the fast development of economy, urban traffic volume increases quickly, traffic congestion appears frequently and the pressure of urban traffic becomes more and more heavy. The transportation problems are always the difficulty that disturbing people of all transportation fields. Cellular Automata model is a mathematical model in which space, time and state values are discrete. It's parallel and simple for computation, so Cellular Automata is a very good tool for simulating variable complex nonlinear phenomena and physical problems.In this dissertation, based on the existing research on Cellular Automata traffic flow model, Several models of traffic flow with mixed vehicles in accordance with real traffic in China are proposed. We present various nonlinear phenomena in traffic system by using computer numerical simulation. The characters of traffic flow in mix models are presented and analyzed. This dissertation consists of the following three main parts:Firstly, With respect to the mixed traffic in realistic life, based on the NaSch model, a cellular automaton traffic model with different maximum length and speed vehicles mixed on single lane on periodic boundary condition is proposed. By using computer numerical simulation, we find that the flux and average velocity of mixed traffic flow is much related with the variety of mixed proportion coefficient on single lane. The share critical of mixed traffic flow increases with the increase in mixed proportion coefficient; when less than share critical, traffic flow will decrease with the increase in mixed proportion coefficient and average velocity has no relationship with mixed proportion coefficient; when more than share critical, traffic flow has no relationship with mixed proportion coefficient basically and average velocity will increase with the increase in mixed proportion coefficient.Secondly, due to the constant change in the number of vehicles, we have researched on the...