Phase transition in evolution of traffic flow with scale-free property  

作　　者：沈波 高自友 

机构地区：[1]State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University [2]School of Traffic and Transportation,Beijing Jiaotong University

出　　处：《Chinese Physics B》2008年第9期3284-3288,共5页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China (973) (Grant No 2006CB705500);the National Natural Science Foundation of China (Grant No 70671008)

摘　　要：This paper investigates the behaviour of traffic flow in traffic systems with a new model based on the NaSch model and cluster approximation of mean-field theory. The proposed model aims at constructing a mapping relationship between the microcosmic behaviour and the macroscopic property of traffic flow. Results demonstrate that scale-free phenomenon of the evolution network becomes obvious when the density value of traffic flow reaches at the critical point of phase transition from free flow to traffic congestion, and jamming is limited in this scale-free structure.This paper investigates the behaviour of traffic flow in traffic systems with a new model based on the NaSch model and cluster approximation of mean-field theory. The proposed model aims at constructing a mapping relationship between the microcosmic behaviour and the macroscopic property of traffic flow. Results demonstrate that scale-free phenomenon of the evolution network becomes obvious when the density value of traffic flow reaches at the critical point of phase transition from free flow to traffic congestion, and jamming is limited in this scale-free structure.

关 键 词：phase transition traffic flow scale-free property cellular automata 

分 类 号：U491.112[交通运输工程—交通运输规划与管理]