Traffic Congestion Mechanism in Two Ramp Systems  

作　　者：赵小梅 宋桂翠 宋玉鲲 

机构地区：[1]School of Traffic and Transportation,Beijing Jiaotong University [2]MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology,Beijing Jiaotong University

出　　处：《Communications in Theoretical Physics》2011年第1期95-100,共6页理论物理通讯（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant No.2006CB705500;the National Natural Science Foundation of China under Grant Nos.70631001,70701004,and 71071012

摘　　要：The aim of this paper is to study traffic properties in an on/off-ramp system with a bus stop close to the on/off ramp. The location of the bus stop in the on/off-ramp （thereafter downstream or upstream case） is discussed. The simulation results show that in the two ramp systems, the reasons for traffic congestions are different. In the on-ramp system, buses and cars coming from on-ramp interweave each other, while in the off-ramp system, buses interweave with cars exiting to off-ramp. Thus, in the on-ramp （off-ramp） system, the upstream （downstream） bus stop is helpful to reduce the interweaving situation. Moreover, the negative effect will disappear when the distance between the bus stop and the on/off-ramp is more than 20 cells （i.e. 150 m）. These qualitative findings may provide some suggestions on traffic management and optimization.

关 键 词：cellular automaton model traffic congestion traffic bottleneck ramp system 

分 类 号：U491[交通运输工程—交通运输规划与管理]