The Simulation Of BRT Priority Intersection Based On Cellular Automata Model

With the rapid development of China’s economy booming and prosperous, city traffic problems are piling up too. Due to road traffic soared, resulting in rapid reduction of per capita road area occupied. Therefore, traffic congestion, slow speed, accidents emissions,noise pollution, all these problems led to the development of our traffic into embarrassing proportions, has seriously hampered the progress of the national economy and reducing the living standards. To the end, different national experts and scholars use different methods and models carried out in-depth research and analysis to complex traffic phenomena in the road and city Road intersection traffic flow during the operation and transport effect. Traffic engineers found the CA(Cellular Automata) model can reflect more complete road traffic system is a complex nonlinear behavior and other physical characteristics. Compared to other models, this model is more conducive to simulate on a computer, especially for parallel computing. And through the flexibility modify the rules to reflect the evolution of the various effects in real traffic. Thus, scholars from various countries use it in urban road traffic flow simulation and road network traffic flow simulation aspects.This paper describes the Cellular Automata basic theory in detail, including its definition from different research areas, rules, and other basic components. Based on this, highlighting the one-dimensional and two-dimensional models, such as the NaSch model based on number184 rules and the evolution of 184 rules, BML model of two-dimensional traffic flow and the extended model, the CA model used in traffic bottlenecks and so on.According to existing research on urban traffic flow characteristics Based with Lanzhou existing BRT(Bus Rapid Transit) Line 1 Intersection for BRT vehicles, measured data information society of the vehicle, intersection signal cycle and various phases of different light color display duration. From the following two aspects to study the intersection signal priority for buses signal priority and priority rights of way how to affect the normal operation of the social traffic.First, based on the VDR model, we introduced the rule of random slowing,and the use of computer simulation in the implementation of green extension and red truncation of two signal priority control strategies to BRT road intersections,the changes in social traffic intersections operational characteristics. So, we could verify the validity of the measures taken.Secondly, based on the original BML model, we combined with the city to run the actual traffic situationa and introduced redirecting probability and lane changing probability respectively.To the BRT lanes prohibiting the intersection of social traffic to turn left, we study from two aspects,one is that the social traffic can choose a certain probability of BMLlane change model to study the results of simulation and analysis based on road conditions around the vehicle and its adjacent;the second is the influence of the redirecting probabilityt to the system performance and the state of traffic flow.