Research And Application On Cellular Automata Of Traffic Flow Model

With the rapid development of social economy in our country, the number of traffic infrastructures has been greatly increased. While as the growth of traffic demand is more rapid than which of road net capacity, the problem of traffic congestion becomes more and more serious, and the number of traffic accidents is increasing, so the traffic problems are considered widely as hot and hard problems. It is vital to solve the traffic congest problems that researching deeply on dynamics characteristic of traffic flow in our country and establishing new-style traffic flow theory. The appear and development of traffic flow cellular automaton model points out a new direction for researching on traffic flow theory, and provides a available model tool for researching on system global behavior and complex phenomena of traffic flow dynamics theory.After generalizing the traffic flow model and its research status, this paper presents the traffic flow cellular automaton model, and studies its variety character based on time and acceleration;researches vehicle conversion coefficient and short distance signal intersection on major road. All above are expatiated as follow:· This paper generalizes the traffic flow model and its research status both home and abroad, which focuses on traffic flow vehicle following model and fluid dynamics model, then analyzes the character of each model.· This paper then analyzes the traffic flow cellular automaton model. NS model and FI model are analyzed comparatively on single dimension and tow dimension, and the research direction of traffic flow cellular automaton model are analyzed from their model rules and simulation results.· This paper also analyzes the traffic flow cellular automaton model based on time and acceleration. The effect character that time affects on the model is preliminary studied from theory, and the maximum flow of cellular automaton model based on following status is studied by introducing acceleration into basic FI model.· This paper analyzes the vehicle conversion coefficient. Variety character of vehicle conversion coefficient is studied from tow aspects of transportation planning and transportation economics based on the traditional vehicle conversion coefficient.· Finally, this paper studies the signal timing on short distance intersection of major road. Being differ from the conventional cellular automaton model which studies the long distance intersection, this paper introduces the research on short distanceintersection, and solves the problem on short distance intersection with the density to be 1 or 0 from aspect of signal control(but not planning and management).